DOC-4594 Mention Prometheus v1 metrics issues resolved by v2 in release notes (#1017)

Author: rrelledge

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-2-34.md

@@ -83,6 +83,22 @@ This version offers:
 
     - V1 Prometheus metrics are deprecated but still available. To transition to the new metrics stream engine, either migrate your existing dashboards using [Prometheus v1 metrics and equivalent v2 PromQL]({{<relref "/integrate/prometheus-with-redis-enterprise/prometheus-metrics-v1-to-v2">}}) now, or wait to use new preconfigured dashboards when they become available in a future release.
 
+    - The new metrics stream engine resolved some known issues and bugs:
+
+        - RS31923: Added missing types to Prometheus metrics.
+
+        - RS80626: Added DMC thread utilization metrics to the metrics exporter.
+
+        - RS113028: Upgraded the node exporter dependency to version 1.7.0.
+
+        - RS103537: Fixed an issue with missing indications when a node went down. You can see the node's metrics up until it went down and can monitor `node_metrics_up` to get an indication that it is down.
+
+        - RS103251: Metrics are now available during state machine operations.
+
+        - RS74732: Fixed an issue where a replica CRDB's stats were missing after removing and then re-adding the replica CRDB instance.
+
+        - RS65948: Fixed an issue where the metrics exporter generated duplicate stats headers when the cluster had both regular databases and Active-Active databases.
+
 - [Rebalance shard placement REST API request]({{<relref "/operate/rs/references/rest-api/requests/bdbs/actions/rebalance">}}), which distributes the database's shards across nodes based on the database's shard placement policy. See [Shard placement policy]({{<relref "/operate/rs/databases/memory-performance/shard-placement-policy">}}) for more information about shard placement and available policies.
 
 - [Shard failover REST API requests]({{<relref "/operate/rs/references/rest-api/requests/shards/actions/failover">}}), which perform failover on specified primary shards and promotes their replicas to primary shards.