Update Telemetry Docs (#23535)

* update remote wal docs

* Update website/content/partials/telemetry-metrics/vault/replication/fsm/last_remote_wal.mdx

Co-authored-by: Sarah Chavis <62406755+schavis@users.noreply.github.com>

---------

Co-authored-by: Sarah Chavis <62406755+schavis@users.noreply.github.com>

website/content/docs/internals/telemetry/metrics/all.mdx

@@ -538,6 +538,8 @@ alphabetic order by name.
 
 @include 'telemetry-metrics/vault/replication/fsm/last_remote_wal.mdx'
 
+@include 'telemetry-metrics/vault/replication/fsm/last_upstream_remote_wal.mdx'
+
 @include 'telemetry-metrics/vault/replication/merkle/commit_index.mdx'
 
 @include 'telemetry-metrics/vault/replication/merklediff.mdx'

website/content/docs/internals/telemetry/metrics/availability.mdx

@@ -73,6 +73,8 @@ your Vault instance. Enterprise installations also include
 
 @include 'telemetry-metrics/vault/replication/fsm/last_remote_wal.mdx'
 
+@include 'telemetry-metrics/vault/replication/fsm/last_upstream_remote_wal.mdx'
+
 @include 'telemetry-metrics/vault/replication/merkle/commit_index.mdx'
 
 @include 'telemetry-metrics/vault/replication/merklediff.mdx'

website/content/partials/telemetry-metrics/vault/replication/fsm/last_remote_wal.mdx

@@ -2,4 +2,9 @@
 
 Metric type | Value   | Description
 ----------- | ------- | -----------
-gauge       | number  | Index of the last remote write-ahead log
+gauge       | number  | Index of the last remote write-ahead log.
+
+
+<Note>
+  Standby nodes do not emit `last_remote_wal` details.
+</Note>

website/content/partials/telemetry-metrics/vault/replication/fsm/last_upstream_remote_wal.mdx

@@ -0,0 +1,5 @@
+### vault.replication.fsm.last_upstream_remote_wal ((#vault-replication-fsm-last_upstream_remote_wal))
+
+Metric type | Value   | Description
+----------- | ------- | -----------
+gauge       | number  | Index of the last remote WAL segment received from the upstream cluster by the local cluster leader.