chore: add tracing to inbox, delivery, actor cache

src/service/delivery.rs

@@ -16,6 +16,11 @@ pub(crate) async fn send_with_retry(
     max_attempts: u32,
     initial_delay_secs: u64,
 ) -> Vec<anyhow::Error> {
+    tracing::info!(
+        inbox_count = sends.len(),
+        max_attempts,
+        "starting outbound delivery"
+    );
     let mut failures = vec![];
     for send in sends {
         let mut delay = std::time::Duration::from_secs(initial_delay_secs);

src/service/fetch.rs

@@ -43,9 +43,17 @@ impl ActivityPubService {
                     tracing::debug!(actor_url, "fetched_at is None, treating as stale — consider populating fetched_at in get_remote_actor()");
                     false
                 });
+            tracing::debug!(
+                actor_url,
+                cache_hit = true,
+                fresh = is_fresh,
+                "actor cache lookup"
+            );
             if is_fresh {
                 return Ok(cached);
             }
+        } else {
+            tracing::debug!(actor_url, cache_hit = false, "actor cache lookup");
         }
         let url = match Url::parse(actor_url) {
             Ok(u) => u,