наблюдаемость: ввести безопасный контракт метрик

apps/admin-api/src/main.rs

@@ -3,6 +3,7 @@ use std::{env, net::SocketAddr, path::PathBuf, time::Duration};
 use admin_api::{
     app::build_app,
     auth::{AuthSettings, BootstrapAdminConfig},
+    pool_metrics::spawn_postgres_pool_metrics,
     service::AdminServiceBuilder,
     state::AppState,
 };
@@ -16,7 +17,7 @@ use crank_runtime::{
     RequestRateLimitConfig, RequestRateLimiter, RuntimeCacheConfig, RuntimeCacheStores,
     RuntimeLimits, SecretCrypto,
 };
-use sqlx::{PgPool, postgres::PgConnectOptions};
+use sqlx::postgres::PgConnectOptions;
 use tokio::net::TcpListener;
 use tracing::{info, warn};
 
@@ -196,16 +197,6 @@ fn spawn_invocation_log_cleanup(service: admin_api::service::AdminService, reten
     });
 }
 
-fn spawn_postgres_pool_metrics(pool: PgPool) {
-    tokio::spawn(async move {
-        let mut interval = tokio::time::interval(Duration::from_secs(5));
-        loop {
-            interval.tick().await;
-            crank_observability::record_db_pool_connections(pool.size(), pool.num_idle());
-        }
-    });
-}
-
 fn env_flag(name: &str) -> bool {
     matches!(
         env::var(name)