• [CHANGE] Fix child routes support in AlertmanagerConfig. #3703
• [FEATURE] Add Slack receiver type to AlertmanagerConfig CRD. #3618
• [FEATURE] Add WeChat receiver type to AlertmanagerConfig CRD. #3619
• [FEATURE] Add Email receiver type to AlertmanagerConfig CRD. #3692
• [FEATURE] Add Pushover receiver type to AlertmanagerConfig CRD. #3697
• [FEATURE] Add VictorOps receiver type to AlertmanagerConfig CRD. #3701
• [FEATURE] Add sharding support for prometheus cluster. #3241
• [ENHANCEMENT] Add option to allow configuring object storage for Thanos. #3668
• [ENHANCEMENT] Add TLS support for remote read. #3714
• [ENHANCEMENT] Include EnforcedSampleLimit as a metric. #3617
• [ENHANCEMENT] Adjust config reloader memory requests and limits. #3660
• [ENHANCEMENT] Add clusterGossipInterval, clusterPushpullInterval and clusterPeerTimeout fields to Alertmanager CRD. #3663
• [BUGFIX] Handle all possible receiver types in AlertmanagerConfig. #3689
• [BUGFIX] Fix operator crashing on empty Probe targets. #3637
• [BUGFIX] Fix usage of --prometheus-default-base-image, --alertmanager-default-base-image, and --thanos-default-base-image flags. #3642
• [BUGFIX] Fix matching labels with empty values when using Exists/NotExists operators. #3686