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Add BlockTimesCache to allow additional block delay metrics (#2546)

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## Issue Addressed

Closes #2528

## Proposed Changes

- Add `BlockTimesCache` to provide block timing information to `BeaconChain`. This allows additional metrics to be calculated for blocks that are set as head too late.
- Thread the `seen_timestamp` of blocks received from RPC responses (except blocks from syncing) through to the sync manager, similar to what is done for blocks from gossip.

## Additional Info

This provides the following additional metrics:
- `BEACON_BLOCK_OBSERVED_SLOT_START_DELAY_TIME`
  - The delay between the start of the slot and when the block was first observed.
- `BEACON_BLOCK_IMPORTED_OBSERVED_DELAY_TIME`
   - The delay between when the block was first observed and when the block was imported.
- `BEACON_BLOCK_HEAD_IMPORTED_DELAY_TIME`
  - The delay between when the block was imported and when the block was set as head.

The metric `BEACON_BLOCK_IMPORTED_SLOT_START_DELAY_TIME` was removed.

A log is produced when a block is set as head too late, e.g.:
```
Aug 27 03:46:39.006 DEBG Delayed head block                      set_as_head_delay: Some(21.731066ms), imported_delay: Some(119.929934ms), observed_delay: Some(3.864596988s), block_delay: 4.006257988s, slot: 1931331, proposer_index: 24294, block_root: 0x937602c89d3143afa89088a44bdf4b4d0d760dad082abacb229495c048648a9e, service: beacon
```
This commit is contained in:
Mac L
2021-09-30 04:31:41 +00:00
parent 70441aa554
commit 4c510f8f6b
14 changed files with 389 additions and 43 deletions
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18
beacon_node/beacon_chain/src/metrics.rs
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@@ -738,17 +738,25 @@ lazy_static! {
/*
* Block Delay Metrics
*/
pub static ref BEACON_BLOCK_IMPORTED_SLOT_START_DELAY_TIME: Result<Histogram> = try_create_histogram(
"beacon_block_imported_slot_start_delay_time",
"Duration between the start of the blocks slot and the current time when it was imported.",
pub static ref BEACON_BLOCK_OBSERVED_SLOT_START_DELAY_TIME: Result<Histogram> = try_create_histogram(
"beacon_block_observed_slot_start_delay_time",
"Duration between the start of the block's slot and the time the block was observed.",
);
pub static ref BEACON_BLOCK_IMPORTED_OBSERVED_DELAY_TIME: Result<Histogram> = try_create_histogram(
"beacon_block_imported_observed_delay_time",
"Duration between the time the block was observed and the time when it was imported.",
);
pub static ref BEACON_BLOCK_HEAD_IMPORTED_DELAY_TIME: Result<Histogram> = try_create_histogram(
"beacon_block_head_imported_delay_time",
"Duration between the time the block was imported and the time when it was set as head.",
);
pub static ref BEACON_BLOCK_HEAD_SLOT_START_DELAY_TIME: Result<Histogram> = try_create_histogram(
"beacon_block_head_slot_start_delay_time",
"Duration between the start of the blocks slot and the current time when it was as head.",
"Duration between the start of the block's slot and the time when it was set as head.",
);
pub static ref BEACON_BLOCK_HEAD_SLOT_START_DELAY_EXCEEDED_TOTAL: Result<IntCounter> = try_create_int_counter(
"beacon_block_head_slot_start_delay_exceeded_total",
"Triggered when the duration between the start of the blocks slot and the current time \
"Triggered when the duration between the start of the block's slot and the current time \
will result in failed attestations.",
);