RELEASE: Multiple Issues (#647)

Closes #639 
Closes #635 
Partially Addresses #590 

- MINIO #16026 https://github.com/minio/minio/pull/16026
- MINIO #16044 https://github.com/minio/minio/pull/16044
- MINIO #16035 https://github.com/minio/minio/pull/16035
- CONSOLE #2428 https://github.com/minio/console/pull/2428

Other Fixes:

- Removes admonition about IDP interactions (multi-IDP support)
- Update Console screenshots and overview page to cover layout changes
- Partial fix for DOCS #590 (Policy now under Identity section)

source/operations/monitoring/metrics-and-alerts.rst

@@ -138,6 +138,8 @@ These metrics are only populated for MinIO clusters with
    Total number of replication operations failed for a given bucket.
    You can identify the bucket using the ``{ bucket="STRING" }`` label.
 
+.. _minio-metrics-and-alerts-capacity:
+
 Capacity Metrics
 ~~~~~~~~~~~~~~~~
 
@@ -172,6 +174,8 @@ Capacity Metrics
    Total storage used on a specific drive for a node in a MinIO deployment. 
    You can identify the drive and node using the ``{ disk="/path/to/disk",server="STRING"}`` labels respectively.
 
+.. _minio-metrics-and-alerts-lifecycle-management:
+
 Lifecycle Management Metrics
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -240,6 +244,31 @@ Node and Drive Health Metrics
    Time elapsed (in nano seconds) since last self healing activity. This is set
    to -1 until initial self heal
 
+Notification Queue Metrics
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. metric:: minio_audit_target_queue_length
+
+   Total number of unsent audit messages in the queue.
+
+.. metric:: minio_audit_total_messages
+
+   Total number of audit messages sent since last server start.
+
+.. metric:: minio_audit_failed_messages
+
+   Total number of audit messages which failed to send since last server start.
+
+.. metric:: minio_notify_current_send_in_progress
+
+   Total number of notification messages in progress to configured targets.
+
+.. metric:: minio_notify_target_queue_length
+
+   Total number of unsent notification messages in the queue.
+
+.. _minio-metrics-and-alerts-scanner:
+
 Scanner Metrics
 ~~~~~~~~~~~~~~~