Fixed --alertmanager.cluster.peers

Signed-off-by: Marco Pracucci <marco@pracucci.com>

CHANGELOG.md

@@ -8,11 +8,12 @@
 * [CHANGE] `CortexIngesterRestarts` alert severity changed from `critical` to `warning`. #321
 * [CHANGE] Store-gateway: increased memory request and limit respectively from 6GB / 6GB to 12GB / 18GB. #322
 * [CHANGE] Store-gateway: increased `-blocks-storage.bucket-store.max-chunk-pool-bytes` from 2GB (default) to 12GB. #322
-* [ENHANCEMENT] cortex-mixin: Make `cluster_namespace_deployment:kube_pod_container_resource_requests_{cpu_cores,memory_bytes}:sum` backwards compatible with `kube-state-metrics` v2.0.0. #317
-* [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
 * [CHANGE] Dashboards: added overridable `job_labels` and `cluster_labels` to the configuration object as label lists to uniquely identify jobs and clusters in the metric names and group-by lists in dashboards. #319
 * [CHANGE] Dashboards: `alert_aggregation_labels` has been removed from the configuration and overriding this value has been deprecated. Instead the labels are now defined by the `cluster_labels` list, and should be overridden accordingly through that list. #319
 * [CHANGE] Ingester/Ruler: set `-server.grpc-max-send-msg-size-bytes` and `-server.grpc-max-send-msg-size-bytes` to sensible default values (10MB). #326
+* [ENHANCEMENT] cortex-mixin: Make `cluster_namespace_deployment:kube_pod_container_resource_requests_{cpu_cores,memory_bytes}:sum` backwards compatible with `kube-state-metrics` v2.0.0. #317
+* [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
 
 ## 1.9.0 / 2021-05-18
 

cortex/alertmanager.libsonnet

@@ -63,7 +63,7 @@
         $.util.mapToFlags($.alertmanager_args) +
         if isHA then
           ['--alertmanager.cluster.listen-address=[$(POD_IP)]:%s' % $._config.alertmanager.gossip_port] +
-          ['--alertmanager.cluster.peers=%s' % peer for peer in peers]
+          ['--alertmanager.cluster.peers=%s' % std.join(',', peers)]
         else [],
       ) +
       container.withVolumeMountsMixin(