Add tracing to slow queries on usage tracking worker (#42505)

Will help debug GitOrigin-RevId: 750a5623862e0dee81986515fb6ba9b1747d8f2c

Author: nipunn1313

crates/common/src/knobs.rs

@@ -1104,6 +1104,14 @@ pub static BACKEND_USAGE_FIREHOSE_NAME: LazyLock<Option<String>> = LazyLock::new
  }
 });
 
+/// If usage tracking worker takes longer than this, trace details to logs.
+pub static USAGE_TRACKING_WORKER_SLOW_TRACE_THRESHOLD: LazyLock<Duration> = LazyLock::new(|| {
+ Duration::from_secs(env_config(
+ "USAGE_TRACKING_WORKER_SLOW_TRACE_THRESHOLD_SECONDS",
+ 120,
+ ))
+});
+
 /// The number of events we can accumulate in the buffer that's used to send
 /// events from our business logic to our firehose client.
 ///