diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index f2378b4f9e..2fd70056cc 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -453,7 +453,7 @@ pub struct BeaconChain<T: BeaconChainTypes> {
     /// A cache of eth1 deposit data at epoch boundaries for deposit finalization
     pub eth1_finalization_cache: TimeoutRwLock<Eth1FinalizationCache>,
     /// Caches the beacon block proposer shuffling for a given epoch and shuffling key root.
-    pub beacon_proposer_cache: Mutex<BeaconProposerCache>,
+    pub beacon_proposer_cache: Arc<Mutex<BeaconProposerCache>>,
     /// Caches a map of `validator_index -> validator_pubkey`.
     pub(crate) validator_pubkey_cache: TimeoutRwLock<ValidatorPubkeyCache<T>>,
     /// A cache used when producing attestations.
diff --git a/beacon_node/beacon_chain/src/beacon_proposer_cache.rs b/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
index eae71bd63e..b51592cadd 100644
--- a/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
+++ b/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
@@ -25,7 +25,7 @@ const CACHE_SIZE: usize = 16;
 /// This value is fairly unimportant, it's used to avoid heap allocations. The result of it being
 /// incorrect is non-substantial from a consensus perspective (and probably also from a
 /// performance perspective).
-const TYPICAL_SLOTS_PER_EPOCH: usize = 32;
+pub const TYPICAL_SLOTS_PER_EPOCH: usize = 32;
 
 /// For some given slot, this contains the proposer index (`index`) and the `fork` that should be
 /// used to verify their signature.
diff --git a/beacon_node/beacon_chain/src/builder.rs b/beacon_node/beacon_chain/src/builder.rs
index fd8a3f0460..bffb23aeb7 100644
--- a/beacon_node/beacon_chain/src/builder.rs
+++ b/beacon_node/beacon_chain/src/builder.rs
@@ -1,4 +1,5 @@
 use crate::beacon_chain::{CanonicalHead, BEACON_CHAIN_DB_KEY, ETH1_CACHE_DB_KEY, OP_POOL_DB_KEY};
+use crate::beacon_proposer_cache::BeaconProposerCache;
 use crate::data_availability_checker::DataAvailabilityChecker;
 use crate::eth1_chain::{CachingEth1Backend, SszEth1};
 use crate::eth1_finalization_cache::Eth1FinalizationCache;
@@ -10,7 +11,7 @@ use crate::persisted_beacon_chain::PersistedBeaconChain;
 use crate::shuffling_cache::{BlockShufflingIds, ShufflingCache};
 use crate::snapshot_cache::{SnapshotCache, DEFAULT_SNAPSHOT_CACHE_SIZE};
 use crate::timeout_rw_lock::TimeoutRwLock;
-use crate::validator_monitor::ValidatorMonitor;
+use crate::validator_monitor::{ValidatorMonitor, ValidatorMonitorConfig};
 use crate::validator_pubkey_cache::ValidatorPubkeyCache;
 use crate::ChainConfig;
 use crate::{
@@ -23,10 +24,10 @@ use fork_choice::{ForkChoice, ResetPayloadStatuses};
 use futures::channel::mpsc::Sender;
 use kzg::{Kzg, TrustedSetup};
 use operation_pool::{OperationPool, PersistedOperationPool};
-use parking_lot::RwLock;
+use parking_lot::{Mutex, RwLock};
 use proto_array::{DisallowedReOrgOffsets, ReOrgThreshold};
 use slasher::Slasher;
-use slog::{crit, debug, error, info, Logger};
+use slog::{crit, debug, error, info, o, Logger};
 use slot_clock::{SlotClock, TestingSlotClock};
 use state_processing::per_slot_processing;
 use std::marker::PhantomData;
@@ -35,8 +36,8 @@ use std::time::Duration;
 use store::{Error as StoreError, HotColdDB, ItemStore, KeyValueStoreOp};
 use task_executor::{ShutdownReason, TaskExecutor};
 use types::{
-    BeaconBlock, BeaconState, ChainSpec, Checkpoint, Epoch, EthSpec, Graffiti, Hash256,
-    PublicKeyBytes, Signature, SignedBeaconBlock, Slot,
+    BeaconBlock, BeaconState, ChainSpec, Checkpoint, Epoch, EthSpec, Graffiti, Hash256, Signature,
+    SignedBeaconBlock, Slot,
 };
 
 /// An empty struct used to "witness" all the `BeaconChainTypes` traits. It has no user-facing
@@ -93,12 +94,12 @@ pub struct BeaconChainBuilder<T: BeaconChainTypes> {
     log: Option<Logger>,
     graffiti: Graffiti,
     slasher: Option<Arc<Slasher<T::EthSpec>>>,
-    validator_monitor: Option<ValidatorMonitor<T::EthSpec>>,
     // Pending I/O batch that is constructed during building and should be executed atomically
     // alongside `PersistedBeaconChain` storage when `BeaconChainBuilder::build` is called.
     pending_io_batch: Vec<KeyValueStoreOp>,
     trusted_setup: Option<TrustedSetup>,
     task_executor: Option<TaskExecutor>,
+    validator_monitor_config: Option<ValidatorMonitorConfig>,
 }
 
 impl<TSlotClock, TEth1Backend, TEthSpec, THotStore, TColdStore>
@@ -135,10 +136,10 @@ where
             log: None,
             graffiti: Graffiti::default(),
             slasher: None,
-            validator_monitor: None,
             pending_io_batch: vec![],
             trusted_setup: None,
             task_executor: None,
+            validator_monitor_config: None,
         }
     }
 
@@ -623,19 +624,8 @@ where
     /// Register some validators for additional monitoring.
     ///
     /// `validators` is a comma-separated string of 0x-formatted BLS pubkeys.
-    pub fn monitor_validators(
-        mut self,
-        auto_register: bool,
-        validators: Vec<PublicKeyBytes>,
-        individual_metrics_threshold: usize,
-        log: Logger,
-    ) -> Self {
-        self.validator_monitor = Some(ValidatorMonitor::new(
-            validators,
-            auto_register,
-            individual_metrics_threshold,
-            log.clone(),
-        ));
+    pub fn validator_monitor_config(mut self, config: ValidatorMonitorConfig) -> Self {
+        self.validator_monitor_config = Some(config);
         self
     }
 
@@ -671,11 +661,16 @@ where
         let genesis_state_root = self
             .genesis_state_root
             .ok_or("Cannot build without a genesis state root")?;
-        let mut validator_monitor = self
-            .validator_monitor
-            .ok_or("Cannot build without a validator monitor")?;
+        let validator_monitor_config = self.validator_monitor_config.unwrap_or_default();
         let head_tracker = Arc::new(self.head_tracker.unwrap_or_default());
 
+        let beacon_proposer_cache: Arc<Mutex<BeaconProposerCache>> = <_>::default();
+        let mut validator_monitor = ValidatorMonitor::new(
+            validator_monitor_config,
+            beacon_proposer_cache.clone(),
+            log.new(o!("service" => "val_mon")),
+        );
+
         let current_slot = if slot_clock
             .is_prior_to_genesis()
             .ok_or("Unable to read slot clock")?
@@ -911,7 +906,7 @@ where
                 log.clone(),
             )),
             eth1_finalization_cache: TimeoutRwLock::new(Eth1FinalizationCache::new(log.clone())),
-            beacon_proposer_cache: <_>::default(),
+            beacon_proposer_cache,
             block_times_cache: <_>::default(),
             pre_finalization_block_cache: <_>::default(),
             validator_pubkey_cache: TimeoutRwLock::new(validator_pubkey_cache),
@@ -1097,7 +1092,6 @@ fn descriptive_db_error(item: &str, error: &StoreError) -> String {
 mod test {
     use super::*;
     use crate::test_utils::EphemeralHarnessType;
-    use crate::validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD;
     use ethereum_hashing::hash;
     use genesis::{
         generate_deterministic_keypairs, interop_genesis_state, DEFAULT_ETH1_BLOCK_HASH,
@@ -1155,12 +1149,6 @@ mod test {
             .testing_slot_clock(Duration::from_secs(1))
             .expect("should configure testing slot clock")
             .shutdown_sender(shutdown_tx)
-            .monitor_validators(
-                true,
-                vec![],
-                DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
-                log.clone(),
-            )
             .build()
             .expect("should build");
 
diff --git a/beacon_node/beacon_chain/src/metrics.rs b/beacon_node/beacon_chain/src/metrics.rs
index a23bcdc0b5..0fe68ba19e 100644
--- a/beacon_node/beacon_chain/src/metrics.rs
+++ b/beacon_node/beacon_chain/src/metrics.rs
@@ -1033,6 +1033,11 @@ lazy_static! {
         "beacon_aggregated_attestation_subsets_total",
         "Count of new aggregated attestations that are subsets of already known aggregates"
     );
+    pub static ref VALIDATOR_MONITOR_MISSED_BLOCKS_TOTAL: Result<IntCounterVec> = try_create_int_counter_vec(
+        "validator_monitor_missed_blocks_total",
+        "Number of non-finalized blocks missed",
+        &["validator"]
+    );
 
     /*
     * Kzg related metrics
diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 333318f52f..23af0c8126 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -6,7 +6,7 @@ pub use crate::{
     beacon_chain::{BEACON_CHAIN_DB_KEY, ETH1_CACHE_DB_KEY, FORK_CHOICE_DB_KEY, OP_POOL_DB_KEY},
     migrate::MigratorConfig,
     sync_committee_verification::Error as SyncCommitteeError,
-    validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
+    validator_monitor::{ValidatorMonitor, ValidatorMonitorConfig},
     BeaconChainError, NotifyExecutionLayer, ProduceBlockVerification,
 };
 use crate::{
@@ -181,6 +181,7 @@ pub struct Builder<T: BeaconChainTypes> {
     execution_layer: Option<ExecutionLayer<T::EthSpec>>,
     mock_execution_layer: Option<MockExecutionLayer<T::EthSpec>>,
     testing_slot_clock: Option<TestingSlotClock>,
+    validator_monitor_config: Option<ValidatorMonitorConfig>,
     runtime: TestRuntime,
     log: Logger,
 }
@@ -316,6 +317,7 @@ where
             execution_layer: None,
             mock_execution_layer: None,
             testing_slot_clock: None,
+            validator_monitor_config: None,
             runtime,
             log,
         }
@@ -388,6 +390,14 @@ where
         self
     }
 
+    pub fn validator_monitor_config(
+        mut self,
+        validator_monitor_config: ValidatorMonitorConfig,
+    ) -> Self {
+        self.validator_monitor_config = Some(validator_monitor_config);
+        self
+    }
+
     /// Purposefully replace the `store_mutator`.
     pub fn override_store_mutator(mut self, mutator: BoxedMutator<E, Hot, Cold>) -> Self {
         assert!(self.store_mutator.is_some(), "store mutator not set");
@@ -494,11 +504,13 @@ where
         let validator_keypairs = self
             .validator_keypairs
             .expect("cannot build without validator keypairs");
-        let chain_config = self.chain_config.unwrap_or_default();
         let trusted_setup: TrustedSetup = serde_json::from_reader(TRUSTED_SETUP_BYTES)
             .map_err(|e| format!("Unable to read trusted setup file: {}", e))
             .unwrap();
 
+        let validator_monitor_config = self.validator_monitor_config.unwrap_or_default();
+
+        let chain_config = self.chain_config.unwrap_or_default();
         let mut builder = BeaconChainBuilder::new(self.eth_spec_instance)
             .logger(log.clone())
             .custom_spec(spec)
@@ -518,7 +530,7 @@ where
                 log.clone(),
                 5,
             )))
-            .monitor_validators(true, vec![], DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD, log)
+            .validator_monitor_config(validator_monitor_config)
             .trusted_setup(trusted_setup);
 
         builder = if let Some(mutator) = self.initial_mutator {
diff --git a/beacon_node/beacon_chain/src/validator_monitor.rs b/beacon_node/beacon_chain/src/validator_monitor.rs
index 396aac71b0..015cdb1c26 100644
--- a/beacon_node/beacon_chain/src/validator_monitor.rs
+++ b/beacon_node/beacon_chain/src/validator_monitor.rs
@@ -2,10 +2,14 @@
 //!
 //! This component should not affect consensus.
 
+use crate::beacon_proposer_cache::{BeaconProposerCache, TYPICAL_SLOTS_PER_EPOCH};
 use crate::metrics;
-use parking_lot::RwLock;
-use slog::{crit, debug, info, Logger};
+use itertools::Itertools;
+use parking_lot::{Mutex, RwLock};
+use serde::{Deserialize, Serialize};
+use slog::{crit, debug, error, info, warn, Logger};
 use slot_clock::SlotClock;
+use smallvec::SmallVec;
 use state_processing::per_epoch_processing::{
     errors::EpochProcessingError, EpochProcessingSummary,
 };
@@ -14,6 +18,7 @@ use std::convert::TryFrom;
 use std::io;
 use std::marker::PhantomData;
 use std::str::Utf8Error;
+use std::sync::Arc;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use store::AbstractExecPayload;
 use types::{
@@ -35,7 +40,34 @@ pub const HISTORIC_EPOCHS: usize = 10;
 /// Once the validator monitor reaches this number of validators it will stop
 /// tracking their metrics/logging individually in an effort to reduce
 /// Prometheus cardinality and log volume.
-pub const DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD: usize = 64;
+const DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD: usize = 64;
+
+/// Lag slots used in detecting missed blocks for the monitored validators
+pub const MISSED_BLOCK_LAG_SLOTS: usize = 4;
+
+/// The number of epochs to look back when determining if a validator has missed a block. This value is used with
+/// the beacon_proposer_cache to determine if a validator has missed a block.
+/// And so, setting this value to anything higher than 1 is likely going to be problematic because the beacon_proposer_cache
+/// is only populated for the current and the previous epoch.
+pub const MISSED_BLOCK_LOOKBACK_EPOCHS: u64 = 1;
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+// Initial configuration values for the `ValidatorMonitor`.
+pub struct ValidatorMonitorConfig {
+    pub auto_register: bool,
+    pub validators: Vec<PublicKeyBytes>,
+    pub individual_tracking_threshold: usize,
+}
+
+impl Default for ValidatorMonitorConfig {
+    fn default() -> Self {
+        Self {
+            auto_register: false,
+            validators: vec![],
+            individual_tracking_threshold: DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
+        }
+    }
+}
 
 #[derive(Debug)]
 pub enum Error {
@@ -323,6 +355,13 @@ impl MonitoredValidator {
     }
 }
 
+#[derive(PartialEq, Hash, Eq)]
+struct MissedBlock {
+    slot: Slot,
+    parent_root: Hash256,
+    validator_index: u64,
+}
+
 /// Holds a collection of `MonitoredValidator` and is notified about a variety of events on the P2P
 /// network, HTTP API and `BeaconChain`.
 ///
@@ -343,26 +382,37 @@ pub struct ValidatorMonitor<T> {
     /// large validator counts causing infeasibly high cardinailty for
     /// Prometheus and high log volumes.
     individual_tracking_threshold: usize,
+    /// A Map representing the (non-finalized) missed blocks by epoch, validator_index(state.validators) and slot
+    missed_blocks: HashSet<MissedBlock>,
+    // A beacon proposer cache
+    beacon_proposer_cache: Arc<Mutex<BeaconProposerCache>>,
     log: Logger,
     _phantom: PhantomData<T>,
 }
 
 impl<T: EthSpec> ValidatorMonitor<T> {
     pub fn new(
-        pubkeys: Vec<PublicKeyBytes>,
-        auto_register: bool,
-        individual_tracking_threshold: usize,
+        config: ValidatorMonitorConfig,
+        beacon_proposer_cache: Arc<Mutex<BeaconProposerCache>>,
         log: Logger,
     ) -> Self {
+        let ValidatorMonitorConfig {
+            auto_register,
+            validators,
+            individual_tracking_threshold,
+        } = config;
+
         let mut s = Self {
             validators: <_>::default(),
             indices: <_>::default(),
             auto_register,
             individual_tracking_threshold,
+            missed_blocks: <_>::default(),
+            beacon_proposer_cache,
             log,
             _phantom: PhantomData,
         };
-        for pubkey in pubkeys {
+        for pubkey in validators {
             s.add_validator_pubkey(pubkey)
         }
         s
@@ -411,6 +461,9 @@ impl<T: EthSpec> ValidatorMonitor<T> {
                 self.indices.insert(i, validator.pubkey);
             });
 
+        // Add missed non-finalized blocks for the monitored validators
+        self.add_validators_missed_blocks(state);
+
         // Update metrics for individual validators.
         for monitored_validator in self.validators.values() {
             if let Some(i) = monitored_validator.index {
@@ -489,6 +542,116 @@ impl<T: EthSpec> ValidatorMonitor<T> {
                 }
             }
         }
+
+        // Prune missed blocks that are prior to last finalized epochs - MISSED_BLOCK_LOOKBACK_EPOCHS
+        let finalized_epoch = state.finalized_checkpoint().epoch;
+        self.missed_blocks.retain(|missed_block| {
+            let epoch = missed_block.slot.epoch(T::slots_per_epoch());
+            epoch + Epoch::new(MISSED_BLOCK_LOOKBACK_EPOCHS) >= finalized_epoch
+        });
+    }
+
+    /// Add missed non-finalized blocks for the monitored validators
+    fn add_validators_missed_blocks(&mut self, state: &BeaconState<T>) {
+        // Define range variables
+        let current_slot = state.slot();
+        let current_epoch = current_slot.epoch(T::slots_per_epoch());
+        // start_slot needs to be coherent with what can be retrieved from the beacon_proposer_cache
+        let start_slot = current_epoch.start_slot(T::slots_per_epoch())
+            - Slot::new(MISSED_BLOCK_LOOKBACK_EPOCHS * T::slots_per_epoch());
+
+        let end_slot = current_slot.saturating_sub(MISSED_BLOCK_LAG_SLOTS).as_u64();
+
+        // List of proposers per epoch from the beacon_proposer_cache
+        let mut proposers_per_epoch: Option<SmallVec<[usize; TYPICAL_SLOTS_PER_EPOCH]>> = None;
+
+        for (prev_slot, slot) in (start_slot.as_u64()..=end_slot)
+            .map(Slot::new)
+            .tuple_windows()
+        {
+            // Condition for missed_block is defined such as block_root(slot) == block_root(slot - 1)
+            // where the proposer who missed the block is the proposer of the block at block_root(slot)
+            if let (Ok(block_root), Ok(prev_block_root)) =
+                (state.get_block_root(slot), state.get_block_root(prev_slot))
+            {
+                // Found missed block
+                if block_root == prev_block_root {
+                    let slot_epoch = slot.epoch(T::slots_per_epoch());
+                    let prev_slot_epoch = prev_slot.epoch(T::slots_per_epoch());
+
+                    if let Ok(shuffling_decision_block) =
+                        state.proposer_shuffling_decision_root_at_epoch(slot_epoch, *block_root)
+                    {
+                        // Only update the cache if it needs to be initialised or because
+                        // slot is at epoch + 1
+                        if proposers_per_epoch.is_none() || slot_epoch != prev_slot_epoch {
+                            proposers_per_epoch = self.get_proposers_by_epoch_from_cache(
+                                slot_epoch,
+                                shuffling_decision_block,
+                            );
+                        }
+
+                        // Only add missed blocks for the proposer if it's in the list of monitored validators
+                        let slot_in_epoch = slot % T::slots_per_epoch();
+                        if let Some(proposer_index) = proposers_per_epoch
+                            .as_deref()
+                            .and_then(|proposers| proposers.get(slot_in_epoch.as_usize()))
+                        {
+                            let i = *proposer_index as u64;
+                            if let Some(pub_key) = self.indices.get(&i) {
+                                if let Some(validator) = self.validators.get(pub_key) {
+                                    let missed_block = MissedBlock {
+                                        slot,
+                                        parent_root: *prev_block_root,
+                                        validator_index: i,
+                                    };
+                                    // Incr missed block counter for the validator only if it doesn't already exist in the hashset
+                                    if self.missed_blocks.insert(missed_block) {
+                                        self.aggregatable_metric(&validator.id, |label| {
+                                            metrics::inc_counter_vec(
+                                                &metrics::VALIDATOR_MONITOR_MISSED_BLOCKS_TOTAL,
+                                                &[label],
+                                            );
+                                        });
+                                        error!(
+                                            self.log,
+                                            "Validator missed a block";
+                                            "index" => i,
+                                            "slot" => slot,
+                                            "parent block root" => ?prev_block_root,
+                                        );
+                                    }
+                                } else {
+                                    warn!(
+                                        self.log,
+                                        "Missing validator index";
+                                        "info" => "potentially inconsistency in the validator manager",
+                                        "index" => i,
+                                    )
+                                }
+                            }
+                        } else {
+                            debug!(
+                                self.log,
+                                "Could not get proposers for from cache";
+                                "epoch" => ?slot_epoch
+                            );
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    fn get_proposers_by_epoch_from_cache(
+        &mut self,
+        epoch: Epoch,
+        shuffling_decision_block: Hash256,
+    ) -> Option<SmallVec<[usize; TYPICAL_SLOTS_PER_EPOCH]>> {
+        let mut cache = self.beacon_proposer_cache.lock();
+        cache
+            .get_epoch::<T>(shuffling_decision_block, epoch)
+            .cloned()
     }
 
     /// Run `func` with the `TOTAL_LABEL` and optionally the
@@ -822,6 +985,17 @@ impl<T: EthSpec> ValidatorMonitor<T> {
         }
     }
 
+    pub fn get_monitored_validator_missed_block_count(&self, validator_index: u64) -> u64 {
+        self.missed_blocks
+            .iter()
+            .filter(|missed_block| missed_block.validator_index == validator_index)
+            .count() as u64
+    }
+
+    pub fn get_beacon_proposer_cache(&self) -> Arc<Mutex<BeaconProposerCache>> {
+        self.beacon_proposer_cache.clone()
+    }
+
     /// If `self.auto_register == true`, add the `validator_index` to `self.monitored_validators`.
     /// Otherwise, do nothing.
     pub fn auto_register_local_validator(&mut self, validator_index: u64) {
diff --git a/beacon_node/beacon_chain/tests/main.rs b/beacon_node/beacon_chain/tests/main.rs
index 332f6a4829..e0564e1510 100644
--- a/beacon_node/beacon_chain/tests/main.rs
+++ b/beacon_node/beacon_chain/tests/main.rs
@@ -10,3 +10,4 @@ mod rewards;
 mod store_tests;
 mod sync_committee_verification;
 mod tests;
+mod validator_monitor;
diff --git a/beacon_node/beacon_chain/tests/store_tests.rs b/beacon_node/beacon_chain/tests/store_tests.rs
index 59a4c1decc..5107396ac2 100644
--- a/beacon_node/beacon_chain/tests/store_tests.rs
+++ b/beacon_node/beacon_chain/tests/store_tests.rs
@@ -8,7 +8,6 @@ use beacon_chain::test_utils::{
     mock_execution_layer_from_parts, test_spec, AttestationStrategy, BeaconChainHarness,
     BlockStrategy, DiskHarnessType,
 };
-use beacon_chain::validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD;
 use beacon_chain::{
     data_availability_checker::MaybeAvailableBlock, historical_blocks::HistoricalBlockError,
     migrate::MigratorConfig, BeaconChain, BeaconChainError, BeaconChainTypes, BeaconSnapshot,
@@ -2358,6 +2357,7 @@ async fn weak_subjectivity_sync_test(slots: Vec<Slot>, checkpoint_slot: Slot) {
         Duration::from_secs(seconds_per_slot),
     );
     slot_clock.set_slot(harness.get_current_slot().as_u64());
+
     let beacon_chain = BeaconChainBuilder::<DiskHarnessType<E>>::new(MinimalEthSpec)
         .store(store.clone())
         .custom_spec(test_spec::<E>())
@@ -2376,7 +2376,6 @@ async fn weak_subjectivity_sync_test(slots: Vec<Slot>, checkpoint_slot: Slot) {
             1,
         )))
         .execution_layer(Some(mock.el))
-        .monitor_validators(true, vec![], DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD, log)
         .trusted_setup(trusted_setup)
         .build()
         .expect("should build");
diff --git a/beacon_node/beacon_chain/tests/validator_monitor.rs b/beacon_node/beacon_chain/tests/validator_monitor.rs
new file mode 100644
index 0000000000..5bc6b758c2
--- /dev/null
+++ b/beacon_node/beacon_chain/tests/validator_monitor.rs
@@ -0,0 +1,299 @@
+use lazy_static::lazy_static;
+
+use beacon_chain::test_utils::{
+    AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
+};
+use beacon_chain::validator_monitor::{ValidatorMonitorConfig, MISSED_BLOCK_LAG_SLOTS};
+use types::{Epoch, EthSpec, Keypair, MainnetEthSpec, PublicKeyBytes, Slot};
+
+// Should ideally be divisible by 3.
+pub const VALIDATOR_COUNT: usize = 48;
+
+lazy_static! {
+    /// A cached set of keys.
+    static ref KEYPAIRS: Vec<Keypair> = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
+}
+
+type E = MainnetEthSpec;
+
+fn get_harness(
+    validator_count: usize,
+    validator_indexes_to_monitor: Vec<usize>,
+) -> BeaconChainHarness<EphemeralHarnessType<E>> {
+    let harness = BeaconChainHarness::builder(MainnetEthSpec)
+        .default_spec()
+        .keypairs(KEYPAIRS[0..validator_count].to_vec())
+        .fresh_ephemeral_store()
+        .mock_execution_layer()
+        .validator_monitor_config(ValidatorMonitorConfig {
+            validators: validator_indexes_to_monitor
+                .iter()
+                .map(|i| PublicKeyBytes::from(KEYPAIRS[*i].pk.clone()))
+                .collect(),
+            ..<_>::default()
+        })
+        .build();
+
+    harness.advance_slot();
+
+    harness
+}
+
+#[tokio::test]
+async fn produces_missed_blocks() {
+    let validator_count = 16;
+
+    let slots_per_epoch = E::slots_per_epoch();
+
+    let nb_epoch_to_simulate = Epoch::new(2);
+
+    // Generate 63 slots (2 epochs * 32 slots per epoch - 1)
+    let initial_blocks = slots_per_epoch * nb_epoch_to_simulate.as_u64() - 1;
+
+    // The validator index of the validator that is 'supposed' to miss a block
+    let mut validator_index_to_monitor = 1;
+
+    // 1st scenario //
+    //
+    // Missed block happens when slot and prev_slot are in the same epoch
+    let harness1 = get_harness(validator_count, vec![validator_index_to_monitor]);
+    harness1
+        .extend_chain(
+            initial_blocks as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    let mut _state = &mut harness1.get_current_state();
+    let mut epoch = _state.current_epoch();
+
+    // We have a total of 63 slots and we want slot 57 to be a missed block
+    // and this is slot=25 in epoch=1
+    let mut idx = initial_blocks - 6;
+    let mut slot = Slot::new(idx);
+    let mut slot_in_epoch = slot % slots_per_epoch;
+    let mut prev_slot = Slot::new(idx - 1);
+    let mut duplicate_block_root = *_state.block_roots().get(idx as usize).unwrap();
+    let mut validator_indexes = _state.get_beacon_proposer_indices(&harness1.spec).unwrap();
+    let mut validator_index = validator_indexes[slot_in_epoch.as_usize()];
+    let mut proposer_shuffling_decision_root = _state
+        .proposer_shuffling_decision_root(duplicate_block_root)
+        .unwrap();
+
+    let beacon_proposer_cache = harness1
+        .chain
+        .validator_monitor
+        .read()
+        .get_beacon_proposer_cache();
+
+    // Let's fill the cache with the proposers for the current epoch
+    // and push the duplicate_block_root to the block_roots vector
+    assert_eq!(
+        beacon_proposer_cache.lock().insert(
+            epoch,
+            proposer_shuffling_decision_root,
+            validator_indexes.into_iter().collect::<Vec<usize>>(),
+            _state.fork()
+        ),
+        Ok(())
+    );
+
+    // Modify the block root of the previous slot to be the same as the block root of the current slot
+    // in order to simulate a missed block
+    assert_eq!(
+        _state.set_block_root(prev_slot, duplicate_block_root),
+        Ok(())
+    );
+
+    {
+        // Let's validate the state which will call the function responsible for
+        // adding the missed blocks to the validator monitor
+        let mut validator_monitor = harness1.chain.validator_monitor.write();
+        validator_monitor.process_valid_state(nb_epoch_to_simulate, _state);
+
+        // We should have one entry in the missed blocks map
+        assert_eq!(
+            validator_monitor.get_monitored_validator_missed_block_count(validator_index as u64),
+            1
+        );
+    }
+
+    // 2nd scenario //
+    //
+    // Missed block happens when slot and prev_slot are not in the same epoch
+    // making sure that the cache reloads when the epoch changes
+    // in that scenario the slot that missed a block is the first slot of the epoch
+    validator_index_to_monitor = 7;
+    // We are adding other validators to monitor as thoses one will miss a block depending on
+    // the fork name specified when running the test as the proposer cache differs depending on the fork name (cf. seed)
+    let validator_index_to_monitor_altair = 2;
+    // Same as above but for the merge upgrade
+    let validator_index_to_monitor_merge = 4;
+    // Same as above but for the capella upgrade
+    let validator_index_to_monitor_capella = 11;
+    // Same as above but for the deneb upgrade
+    let validator_index_to_monitor_deneb = 3;
+    let harness2 = get_harness(
+        validator_count,
+        vec![
+            validator_index_to_monitor,
+            validator_index_to_monitor_altair,
+            validator_index_to_monitor_merge,
+            validator_index_to_monitor_capella,
+            validator_index_to_monitor_deneb,
+        ],
+    );
+    let advance_slot_by = 9;
+    harness2
+        .extend_chain(
+            (initial_blocks + advance_slot_by) as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    let mut _state2 = &mut harness2.get_current_state();
+    epoch = _state2.current_epoch();
+
+    // We have a total of 72 slots and we want slot 64 to be the missed block
+    // and this is slot=64 in epoch=2
+    idx = initial_blocks + (advance_slot_by) - 8;
+    slot = Slot::new(idx);
+    prev_slot = Slot::new(idx - 1);
+    slot_in_epoch = slot % slots_per_epoch;
+    duplicate_block_root = *_state2.block_roots().get(idx as usize).unwrap();
+    validator_indexes = _state2.get_beacon_proposer_indices(&harness2.spec).unwrap();
+    validator_index = validator_indexes[slot_in_epoch.as_usize()];
+
+    let beacon_proposer_cache = harness2
+        .chain
+        .validator_monitor
+        .read()
+        .get_beacon_proposer_cache();
+
+    // Let's fill the cache with the proposers for the current epoch
+    // and push the duplicate_block_root to the block_roots vector
+    assert_eq!(
+        beacon_proposer_cache.lock().insert(
+            epoch,
+            duplicate_block_root,
+            validator_indexes.into_iter().collect::<Vec<usize>>(),
+            _state2.fork()
+        ),
+        Ok(())
+    );
+
+    assert_eq!(
+        _state2.set_block_root(prev_slot, duplicate_block_root),
+        Ok(())
+    );
+
+    {
+        // Let's validate the state which will call the function responsible for
+        // adding the missed blocks to the validator monitor
+        let mut validator_monitor2 = harness2.chain.validator_monitor.write();
+        validator_monitor2.process_valid_state(epoch, _state2);
+        // We should have one entry in the missed blocks map
+        assert_eq!(
+            validator_monitor2.get_monitored_validator_missed_block_count(validator_index as u64),
+            1
+        );
+
+        // 3rd scenario //
+        //
+        // A missed block happens but the validator is not monitored
+        // it should not be flagged as a missed block
+        idx = initial_blocks + (advance_slot_by) - 7;
+        slot = Slot::new(idx);
+        prev_slot = Slot::new(idx - 1);
+        slot_in_epoch = slot % slots_per_epoch;
+        duplicate_block_root = *_state2.block_roots().get(idx as usize).unwrap();
+        validator_indexes = _state2.get_beacon_proposer_indices(&harness2.spec).unwrap();
+        let not_monitored_validator_index = validator_indexes[slot_in_epoch.as_usize()];
+
+        assert_eq!(
+            _state2.set_block_root(prev_slot, duplicate_block_root),
+            Ok(())
+        );
+
+        // Let's validate the state which will call the function responsible for
+        // adding the missed blocks to the validator monitor
+        validator_monitor2.process_valid_state(epoch, _state2);
+
+        // We shouldn't have any entry in the missed blocks map
+        assert_ne!(validator_index, not_monitored_validator_index);
+        assert_eq!(
+            validator_monitor2
+                .get_monitored_validator_missed_block_count(not_monitored_validator_index as u64),
+            0
+        );
+    }
+
+    // 4th scenario //
+    //
+    // A missed block happens at state.slot - LOG_SLOTS_PER_EPOCH
+    // it shouldn't be flagged as a missed block
+    let harness3 = get_harness(validator_count, vec![validator_index_to_monitor]);
+    harness3
+        .extend_chain(
+            slots_per_epoch as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    let mut _state3 = &mut harness3.get_current_state();
+    epoch = _state3.current_epoch();
+
+    // We have a total of 32 slots and we want slot 30 to be a missed block
+    // and this is slot=30 in epoch=0
+    idx = slots_per_epoch - MISSED_BLOCK_LAG_SLOTS as u64 + 2;
+    slot = Slot::new(idx);
+    slot_in_epoch = slot % slots_per_epoch;
+    prev_slot = Slot::new(idx - 1);
+    duplicate_block_root = *_state3.block_roots().get(idx as usize).unwrap();
+    validator_indexes = _state3.get_beacon_proposer_indices(&harness3.spec).unwrap();
+    validator_index = validator_indexes[slot_in_epoch.as_usize()];
+    proposer_shuffling_decision_root = _state3
+        .proposer_shuffling_decision_root_at_epoch(epoch, duplicate_block_root)
+        .unwrap();
+
+    let beacon_proposer_cache = harness3
+        .chain
+        .validator_monitor
+        .read()
+        .get_beacon_proposer_cache();
+
+    // Let's fill the cache with the proposers for the current epoch
+    // and push the duplicate_block_root to the block_roots vector
+    assert_eq!(
+        beacon_proposer_cache.lock().insert(
+            epoch,
+            proposer_shuffling_decision_root,
+            validator_indexes.into_iter().collect::<Vec<usize>>(),
+            _state3.fork()
+        ),
+        Ok(())
+    );
+
+    // Modify the block root of the previous slot to be the same as the block root of the current slot
+    // in order to simulate a missed block
+    assert_eq!(
+        _state3.set_block_root(prev_slot, duplicate_block_root),
+        Ok(())
+    );
+
+    {
+        // Let's validate the state which will call the function responsible for
+        // adding the missed blocks to the validator monitor
+        let mut validator_monitor3 = harness3.chain.validator_monitor.write();
+        validator_monitor3.process_valid_state(epoch, _state3);
+
+        // We shouldn't have one entry in the missed blocks map
+        assert_eq!(
+            validator_monitor3.get_monitored_validator_missed_block_count(validator_index as u64),
+            0
+        );
+    }
+}
diff --git a/beacon_node/client/src/builder.rs b/beacon_node/client/src/builder.rs
index d1184cf75d..fe8a56084d 100644
--- a/beacon_node/client/src/builder.rs
+++ b/beacon_node/client/src/builder.rs
@@ -191,15 +191,7 @@ where
             .graffiti(graffiti)
             .event_handler(event_handler)
             .execution_layer(execution_layer)
-            .monitor_validators(
-                config.validator_monitor_auto,
-                config.validator_monitor_pubkeys.clone(),
-                config.validator_monitor_individual_tracking_threshold,
-                runtime_context
-                    .service_context("val_mon".to_string())
-                    .log()
-                    .clone(),
-            );
+            .validator_monitor_config(config.validator_monitor.clone());
 
         let builder = if let Some(slasher) = self.slasher.clone() {
             builder.slasher(slasher)
diff --git a/beacon_node/client/src/config.rs b/beacon_node/client/src/config.rs
index 8b47d0fc62..492431cd36 100644
--- a/beacon_node/client/src/config.rs
+++ b/beacon_node/client/src/config.rs
@@ -1,4 +1,4 @@
-use beacon_chain::validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD;
+use beacon_chain::validator_monitor::ValidatorMonitorConfig;
 use beacon_chain::TrustedSetup;
 use beacon_processor::BeaconProcessorConfig;
 use directory::DEFAULT_ROOT_DIR;
@@ -9,7 +9,7 @@ use serde::{Deserialize, Serialize};
 use std::fs;
 use std::path::PathBuf;
 use std::time::Duration;
-use types::{Graffiti, PublicKeyBytes};
+use types::Graffiti;
 /// Default directory name for the freezer database under the top-level data dir.
 const DEFAULT_FREEZER_DB_DIR: &str = "freezer_db";
 
@@ -56,15 +56,7 @@ pub struct Config {
     pub sync_eth1_chain: bool,
     /// Graffiti to be inserted everytime we create a block.
     pub graffiti: Graffiti,
-    /// When true, automatically monitor validators using the HTTP API.
-    pub validator_monitor_auto: bool,
-    /// A list of validator pubkeys to monitor.
-    pub validator_monitor_pubkeys: Vec<PublicKeyBytes>,
-    /// Once the number of monitored validators goes above this threshold, we
-    /// will stop tracking metrics on a per-validator basis. This prevents large
-    /// validator counts causing infeasibly high cardinailty for Prometheus and
-    /// high log volumes.
-    pub validator_monitor_individual_tracking_threshold: usize,
+    pub validator_monitor: ValidatorMonitorConfig,
     #[serde(skip)]
     /// The `genesis` field is not serialized or deserialized by `serde` to ensure it is defined
     /// via the CLI at runtime, instead of from a configuration file saved to disk.
@@ -107,9 +99,7 @@ impl Default for Config {
             http_metrics: <_>::default(),
             monitoring_api: None,
             slasher: None,
-            validator_monitor_auto: false,
-            validator_monitor_pubkeys: vec![],
-            validator_monitor_individual_tracking_threshold: DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
+            validator_monitor: <_>::default(),
             logger_config: LoggerConfig::default(),
             beacon_processor: <_>::default(),
             genesis_state_url: <_>::default(),
diff --git a/beacon_node/http_api/src/proposer_duties.rs b/beacon_node/http_api/src/proposer_duties.rs
index 708df39b4d..c31dd9b1fa 100644
--- a/beacon_node/http_api/src/proposer_duties.rs
+++ b/beacon_node/http_api/src/proposer_duties.rs
@@ -97,12 +97,12 @@ fn try_proposer_duties_from_cache<T: BeaconChainTypes>(
     let head = chain.canonical_head.cached_head();
     let head_block = &head.snapshot.beacon_block;
     let head_block_root = head.head_block_root();
+    let head_epoch = head_block.slot().epoch(T::EthSpec::slots_per_epoch());
     let head_decision_root = head
         .snapshot
         .beacon_state
         .proposer_shuffling_decision_root(head_block_root)
         .map_err(warp_utils::reject::beacon_state_error)?;
-    let head_epoch = head_block.slot().epoch(T::EthSpec::slots_per_epoch());
     let execution_optimistic = chain
         .is_optimistic_or_invalid_head_block(head_block)
         .map_err(warp_utils::reject::beacon_chain_error)?;
diff --git a/beacon_node/network/src/subnet_service/tests/mod.rs b/beacon_node/network/src/subnet_service/tests/mod.rs
index 3b8c89a442..769775a62c 100644
--- a/beacon_node/network/src/subnet_service/tests/mod.rs
+++ b/beacon_node/network/src/subnet_service/tests/mod.rs
@@ -2,7 +2,6 @@ use super::*;
 use beacon_chain::{
     builder::{BeaconChainBuilder, Witness},
     eth1_chain::CachingEth1Backend,
-    validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
     BeaconChain,
 };
 use futures::prelude::*;
@@ -76,7 +75,6 @@ impl TestBeaconChain {
                     Duration::from_millis(SLOT_DURATION_MILLIS),
                 ))
                 .shutdown_sender(shutdown_tx)
-                .monitor_validators(true, vec![], DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD, log)
                 .build()
                 .expect("should build"),
         );
diff --git a/beacon_node/src/config.rs b/beacon_node/src/config.rs
index 94b94677a5..a4fdf94c66 100644
--- a/beacon_node/src/config.rs
+++ b/beacon_node/src/config.rs
@@ -719,7 +719,7 @@ pub fn get_config<E: EthSpec>(
     }
 
     if cli_args.is_present("validator-monitor-auto") {
-        client_config.validator_monitor_auto = true;
+        client_config.validator_monitor.auto_register = true;
     }
 
     if let Some(pubkeys) = cli_args.value_of("validator-monitor-pubkeys") {
@@ -729,7 +729,8 @@ pub fn get_config<E: EthSpec>(
             .collect::<Result<Vec<_>, _>>()
             .map_err(|e| format!("Invalid --validator-monitor-pubkeys value: {:?}", e))?;
         client_config
-            .validator_monitor_pubkeys
+            .validator_monitor
+            .validators
             .extend_from_slice(&pubkeys);
     }
 
@@ -747,14 +748,17 @@ pub fn get_config<E: EthSpec>(
             .collect::<Result<Vec<_>, _>>()
             .map_err(|e| format!("Invalid --validator-monitor-file contents: {:?}", e))?;
         client_config
-            .validator_monitor_pubkeys
+            .validator_monitor
+            .validators
             .extend_from_slice(&pubkeys);
     }
 
     if let Some(count) =
         clap_utils::parse_optional(cli_args, "validator-monitor-individual-tracking-threshold")?
     {
-        client_config.validator_monitor_individual_tracking_threshold = count;
+        client_config
+            .validator_monitor
+            .individual_tracking_threshold = count;
     }
 
     if cli_args.is_present("disable-lock-timeouts") {
@@ -850,7 +854,7 @@ pub fn get_config<E: EthSpec>(
     // Graphical user interface config.
     if cli_args.is_present("gui") {
         client_config.http_api.enabled = true;
-        client_config.validator_monitor_auto = true;
+        client_config.validator_monitor.auto_register = true;
     }
 
     // Optimistic finalized sync.
diff --git a/consensus/types/src/beacon_state.rs b/consensus/types/src/beacon_state.rs
index 18b9866f35..e2e25f24b8 100644
--- a/consensus/types/src/beacon_state.rs
+++ b/consensus/types/src/beacon_state.rs
@@ -626,6 +626,25 @@ impl<T: EthSpec> BeaconState<T> {
         cache.get_all_beacon_committees()
     }
 
+    /// Returns the block root which decided the proposer shuffling for the epoch passed in parameter. This root
+    /// can be used to key this proposer shuffling.
+    ///
+    /// ## Notes
+    ///
+    /// The `block_root` must be equal to the latest block applied to `self`.
+    pub fn proposer_shuffling_decision_root_at_epoch(
+        &self,
+        epoch: Epoch,
+        block_root: Hash256,
+    ) -> Result<Hash256, Error> {
+        let decision_slot = self.proposer_shuffling_decision_slot(epoch);
+        if self.slot() <= decision_slot {
+            Ok(block_root)
+        } else {
+            self.get_block_root(decision_slot).map(|root| *root)
+        }
+    }
+
     /// Returns the block root which decided the proposer shuffling for the current epoch. This root
     /// can be used to key this proposer shuffling.
     ///
@@ -634,7 +653,7 @@ impl<T: EthSpec> BeaconState<T> {
     /// The `block_root` covers the one-off scenario where the genesis block decides its own
     /// shuffling. It should be set to the latest block applied to `self` or the genesis block root.
     pub fn proposer_shuffling_decision_root(&self, block_root: Hash256) -> Result<Hash256, Error> {
-        let decision_slot = self.proposer_shuffling_decision_slot();
+        let decision_slot = self.proposer_shuffling_decision_slot(self.current_epoch());
         if self.slot() == decision_slot {
             Ok(block_root)
         } else {
@@ -643,11 +662,9 @@ impl<T: EthSpec> BeaconState<T> {
     }
 
     /// Returns the slot at which the proposer shuffling was decided. The block root at this slot
-    /// can be used to key the proposer shuffling for the current epoch.
-    fn proposer_shuffling_decision_slot(&self) -> Slot {
-        self.current_epoch()
-            .start_slot(T::slots_per_epoch())
-            .saturating_sub(1_u64)
+    /// can be used to key the proposer shuffling for the given epoch.
+    fn proposer_shuffling_decision_slot(&self, epoch: Epoch) -> Slot {
+        epoch.start_slot(T::slots_per_epoch()).saturating_sub(1_u64)
     }
 
     /// Returns the block root which decided the attester shuffling for the given `relative_epoch`.
diff --git a/lighthouse/tests/beacon_node.rs b/lighthouse/tests/beacon_node.rs
index 7937b1d496..c416aba4fc 100644
--- a/lighthouse/tests/beacon_node.rs
+++ b/lighthouse/tests/beacon_node.rs
@@ -1772,11 +1772,17 @@ fn metrics_allow_origin_all_flag() {
 
 // Tests for Validator Monitor flags.
 #[test]
+fn validator_monitor_default_values() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| assert!(config.validator_monitor == <_>::default()));
+}
+#[test]
 fn validator_monitor_auto_flag() {
     CommandLineTest::new()
         .flag("validator-monitor-auto", None)
         .run_with_zero_port()
-        .with_config(|config| assert!(config.validator_monitor_auto));
+        .with_config(|config| assert!(config.validator_monitor.auto_register));
 }
 #[test]
 fn validator_monitor_pubkeys_flag() {
@@ -1785,8 +1791,8 @@ fn validator_monitor_pubkeys_flag() {
                                                 0xbeefdeadbeefdeaddeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef"))
         .run_with_zero_port()
         .with_config(|config| {
-            assert_eq!(config.validator_monitor_pubkeys[0].to_string(), "0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
-            assert_eq!(config.validator_monitor_pubkeys[1].to_string(), "0xbeefdeadbeefdeaddeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+            assert_eq!(config.validator_monitor.validators[0].to_string(), "0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+            assert_eq!(config.validator_monitor.validators[1].to_string(), "0xbeefdeadbeefdeaddeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
         });
 }
 #[test]
@@ -1800,8 +1806,8 @@ fn validator_monitor_file_flag() {
         .flag("validator-monitor-file", dir.path().join("pubkeys.txt").as_os_str().to_str())
         .run_with_zero_port()
         .with_config(|config| {
-            assert_eq!(config.validator_monitor_pubkeys[0].to_string(), "0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
-            assert_eq!(config.validator_monitor_pubkeys[1].to_string(), "0xbeefdeadbeefdeaddeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+            assert_eq!(config.validator_monitor.validators[0].to_string(), "0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+            assert_eq!(config.validator_monitor.validators[1].to_string(), "0xbeefdeadbeefdeaddeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
         });
 }
 #[test]
@@ -1810,7 +1816,7 @@ fn validator_monitor_metrics_threshold_default() {
         .run_with_zero_port()
         .with_config(|config| {
             assert_eq!(
-                config.validator_monitor_individual_tracking_threshold,
+                config.validator_monitor.individual_tracking_threshold,
                 // If this value changes make sure to update the help text for
                 // the CLI command.
                 64
@@ -1826,7 +1832,7 @@ fn validator_monitor_metrics_threshold_custom() {
         )
         .run_with_zero_port()
         .with_config(|config| {
-            assert_eq!(config.validator_monitor_individual_tracking_threshold, 42)
+            assert_eq!(config.validator_monitor.individual_tracking_threshold, 42)
         });
 }
 
@@ -2472,7 +2478,7 @@ fn gui_flag() {
         .run_with_zero_port()
         .with_config(|config| {
             assert!(config.http_api.enabled);
-            assert!(config.validator_monitor_auto);
+            assert!(config.validator_monitor.auto_register);
         });
 }