refactor(stats): log stats update skip decision (#967)

* feat: log update skip

* log(stats): debug log the timestamps to clearly see the decision process

stats/stats/src/data_source/kinds/local_db/mod.rs

@@ -154,7 +154,16 @@ where
                 // no need to perform update.
                 // mostly catches second call to update e.g. when both
                 // dependency and this source are in one group and enabled.
+                tracing::debug!(
+                    "Not updating the chart because it was already handled within ongoing update"
+                );
                 return Ok(());
+            } else {
+                tracing::debug!(
+                    last_updated_at =? last_updated_at,
+                    update_timestamp =? cx.time,
+                    "Performing an update"
+                );
             }
         }
         let chart_id = metadata.id;