chore: improve changelog

instrumentation/opentelemetry_oban/CHANGELOG.md

@@ -4,8 +4,33 @@
 
 ### Changed
 
-* Improve Plugin span attributes. The Plugin's span introduce a set of
-  attributes prefixed with `oban.`.
+* Improve `OpentelemetryOban.PluginHandler` Tracer span attributes.
+  The Plugin's span introduce a set of attributes prefixed with `oban.`.
+  Previously, no attributes were added to the span. The new attributes are:
+
+  * All Plugin:
+    * `oban.plugin`
+  * `Oban.Plugins.Cron` Plugin:
+    * `oban.jobs_count`
+  * `Oban.Plugins.Gossip` Plugin:
+    * `oban.gossip_count`
+  * `Oban.Plugins.Lifeline` Plugin:
+    * `oban.discarded_count`
+    * `oban.rescued_count`
+  * `Oban.Plugins.Pruner` Plugin:
+    * `oban.pruned_count`
+  * `Oban.Pro.Plugins.DynamicCron` Plugin:
+    * `oban.jobs_count`
+  * `Oban.Pro.Plugins.DynamicLifeline` Plugin:
+    * `oban.discarded_count`
+    * `oban.rescued_count`
+  * `Oban.Pro.Plugins.DynamicPrioritizer` Plugin:
+    * `oban.reprioritized_count`
+  * `Oban.Pro.Plugins.DynamicPruner` Plugin:
+    * `oban.pruned_count`
+  * `Oban.Pro.Plugins.DynamicScaler` Plugin:
+    * `oban.scaler.last_scaled_to`
+    * `oban.scaler.last_scaled_at`
 
 ## 1.0.0