fix queue size metrics with priorities

src/metrics/mod.rs

@@ -307,7 +307,14 @@ impl ServiceMetrics {
 
  let queue_pending_count = queue.pending_count_by_priority()?;
 
- for (priority, count) in queue_pending_count.iter() {
+ // we reset the metric so we won't keep old gauge values around
+ // when a certain priority is no longer used in the queue.
+ self.queued_crates_count_by_priority.reset();
+
+ // for commonly used priorities we want the value to be zero, and not missing,
+ // when there are no items in the queue with that priority.
+ for priority in 0..=20 {
+ let count = queue_pending_count.get(&priority).unwrap_or(&0);
  self.queued_crates_count_by_priority
  .with_label_values(&[&priority.to_string()])
  .set(*count as i64);

src/web/mod.rs

@@ -357,10 +357,16 @@ pub fn start_web_server(addr: Option<SocketAddr>, context: &dyn Context) -> Resu
  // initialize the storage and the repo-updater in sync context
  // so it can stay sync for now and doesn't fail when they would
  // be initialized while starting the server below.
+ tracing::info!("initializing storage");
  context.storage()?;
+
+ tracing::info!("initializing repository stats updater");
  context.repository_stats_updater()?;
 
+ tracing::info!("building axum app");
  let app = build_axum_app(context, template_data)?.into_make_service();
+
+ tracing::info!("starting axum server");
  context.runtime()?.block_on(async {
  axum::Server::bind(&axum_addr)
  .serve(app)