• [FEATURE] Add incident.io notifier. #4372
• [FEATURE] Add monospace message formatting. #4362
• [FEATURE] Add ability to customize interval for maintenance to run. #4541
• [ENHANCEMENT] Update Jira notifier to support both Jira cloud API v3 and Jira datacenter API v2. #4542
• [ENHANCEMENT] Increase mixin rate intervals for alert FailedToSendAlerts. #4206
• [ENHANCEMENT] Make /alertmanager group writable in docker image. #4469
• [BUGFIX] Fix logged notification count on error in notify. #4323
• [BUGFIX] Fix docker image permissions path. #4288
• [BUGFIX] Fix error handling in template rendering for Telegram. #4353
• [BUGFIX] Fix duplicate other in error messages for config. #4366
• [BUGFIX] Fix logic that considers an alert reopened in Jira. #4478