Merge pull request #2270 from mcdee/process-start-time-metric

Add process_start_time_seconds metric

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Pathfinder now fetches data concurrently from the feeder gateway when catching up. The `--gateway.fetch-concurrency` CLI option can be used to limit how many blocks are fetched concurrently (the default is 8).
 - `--disable-version-update-check` CLI option has been added to disable the periodic checking for a new version.
+- add `process_start_time_seconds` metric showing the unix timestamp when the process started.
 
 ### Changed
 

README.md

@@ -317,6 +317,10 @@ This endpoint is useful for Docker nodes which only want to present themselves a
 
 `/metrics` provides a [Prometheus](https://prometheus.io/) metrics scrape endpoint. Currently the following metrics are available:
 
+#### Process metrics
+
+- `process_start_time_seconds` provides the unix timestamp at which pathfinder started
+
 #### RPC related counters
 
 - `rpc_method_calls_total`,

crates/pathfinder/src/bin/pathfinder/main.rs

@@ -5,6 +5,7 @@ use std::num::NonZeroU32;
 use std::path::PathBuf;
 use std::sync::atomic::AtomicBool;
 use std::sync::Arc;
+use std::time::{SystemTime, UNIX_EPOCH};
 
 use anyhow::Context;
 use metrics_exporter_prometheus::PrometheusBuilder;
@@ -642,6 +643,11 @@ async fn spawn_monitoring(
 
     metrics::gauge!("pathfinder_build_info", 1.0, "version" => VERGEN_GIT_DESCRIBE);
 
+    match SystemTime::now().duration_since(UNIX_EPOCH) {
+        Ok(duration) => metrics::gauge!("process_start_time_seconds", duration.as_secs() as f64),
+        Err(err) => tracing::error!("Failed to read system time: {:?}", err),
+    }
+
     let (_, handle) =
         monitoring::spawn_server(address, readiness, sync_state, prometheus_handle).await?;
     Ok(handle)