Review comments.

Author: stevesg

CHANGELOG.md

@@ -34,9 +34,10 @@
 * [ENHANCEMENT] Added a new tier (`medium_small_user`) so we have another tier between 100K and 1Mil active series. #364
 * [ENHANCEMENT] Extend Alertmanager dashboard: #313
   * "Tenants" stat panel - shows number of discovered tenant configurations.
+  * "Replication" row - information about the replication of tenants/alerts/silences over instances.
   * "Tenant Configuration Sync" row - information about the configuration sync procedure.
   * "Sharding Initial State Sync" row - information about the initial state sync procedure when sharding is enabled.
-  * "Sharding State Operations" row - information about various state operations which occur when sharding is enabled (replication, fetch, marge, persist).
+  * "Sharding Runtime State Sync" row - information about various state operations which occur when sharding is enabled (replication, fetch, marge, persist).
 * [BUGFIX] Fixed `CortexIngesterHasNotShippedBlocks` alert false positive in case an ingester instance had ingested samples in the past, then no traffic was received for a long period and then it started receiving samples again. #308
 * [BUGFIX] Alertmanager: fixed `--alertmanager.cluster.peers` CLI flag passed to alertmanager when HA is enabled. #329
 * [BUGFIX] Fixed `CortexInconsistentRuntimeConfig` metric. #335

cortex-mixin/dashboards/alertmanager.libsonnet

@@ -149,16 +149,16 @@ local utils = import 'mixin-utils/utils.libsonnet';
       )
     )
     .addRow(
-      $.row('Sharding Runtime State Sync')
+      $.row('Sharding Initial State Sync')
       .addPanel(
-        $.panel('Syncs/sec') +
+        $.panel('Initial syncs/sec') +
         $.queryPanel(
           'sum by(outcome) (rate(cortex_alertmanager_state_initial_sync_completed_total{%s}[$__rate_interval]))' % $.jobMatcher('alertmanager'),
           '{{outcome}}'
         )
       )
       .addPanel(
-        $.panel('Sync duration') +
+        $.panel('Initial sync duration') +
         $.latencyPanel('cortex_alertmanager_state_initial_sync_duration_seconds', '{%s}' % $.jobMatcher('alertmanager'))
       )
       .addPanel(
@@ -177,7 +177,7 @@ local utils = import 'mixin-utils/utils.libsonnet';
       )
     )
     .addRow(
-      $.row('Sharding State Operations')
+      $.row('Sharding Runtime State Sync')
       .addPanel(
         $.panel('Replicate state to other alertmanagers /sec') +
         $.queryPanel(