Integrate tracing (#6339)

Tracing Integration
- [reference](5bbf1859e9/projects/project-ideas.md (L297))


  - [x] replace slog & log with tracing throughout the codebase
- [x] implement custom crit log
- [x] make relevant changes in the formatter
- [x] replace sloggers
- [x] re-write SSE logging components

cc: @macladson @eserilev

validator_client/http_metrics/Cargo.toml

@@ -7,12 +7,13 @@ authors = ["Sigma Prime <contact@sigmaprime.io>"]
 [dependencies]
 health_metrics = { workspace = true }
 lighthouse_version = { workspace = true }
+logging = { workspace = true }
 malloc_utils = { workspace = true }
 metrics = { workspace = true }
 parking_lot = { workspace = true }
 serde = { workspace = true }
-slog = { workspace = true }
 slot_clock = { workspace = true }
+tracing = { workspace = true }
 types = { workspace = true }
 validator_metrics = { workspace = true }
 validator_services = { workspace = true }

validator_client/http_metrics/src/lib.rs

@@ -3,15 +3,16 @@
 //! For other endpoints, see the `http_api` crate.
 
 use lighthouse_version::version_with_platform;
+use logging::crit;
 use malloc_utils::scrape_allocator_metrics;
 use parking_lot::RwLock;
 use serde::{Deserialize, Serialize};
-use slog::{crit, info, Logger};
 use slot_clock::{SlotClock, SystemTimeSlotClock};
 use std::future::Future;
 use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 use std::sync::Arc;
 use std::time::{SystemTime, UNIX_EPOCH};
+use tracing::info;
 use types::EthSpec;
 use validator_services::duties_service::DutiesService;
 use validator_store::ValidatorStore;
@@ -48,7 +49,6 @@ pub struct Shared<E: EthSpec> {
 pub struct Context<E: EthSpec> {
     pub config: Config,
     pub shared: RwLock<Shared<E>>,
-    pub log: Logger,
 }
 
 /// Configuration for the HTTP server.
@@ -93,7 +93,6 @@ pub fn serve<E: EthSpec>(
     shutdown: impl Future<Output = ()> + Send + Sync + 'static,
 ) -> Result<(SocketAddr, impl Future<Output = ()>), Error> {
     let config = &ctx.config;
-    let log = ctx.log.clone();
 
     // Configure CORS.
     let cors_builder = {
@@ -110,7 +109,7 @@ pub fn serve<E: EthSpec>(
 
     // Sanity check.
     if !config.enabled {
-        crit!(log, "Cannot start disabled metrics HTTP server");
+        crit!("Cannot start disabled metrics HTTP server");
         return Err(Error::Other(
             "A disabled metrics server should not be started".to_string(),
         ));
@@ -151,9 +150,8 @@ pub fn serve<E: EthSpec>(
     )?;
 
     info!(
-        log,
-        "Metrics HTTP server started";
-        "listen_address" => listening_socket.to_string(),
+        listen_address = listening_socket.to_string(),
+        "Metrics HTTP server started"
     );
 
     Ok((listening_socket, server))