• [CHANGE] Add the /api/v2 prefix to all endpoints in the OpenAPI specification and generated client code. #2696
• [CHANGE] Remove the github.com/prometheus/alertmanager/client Go package. #2763
• [FEATURE] Add --cluster.tls-config experimental flag to secure cluster traffic via mutual TLS. #2237
• [FEATURE] Add support for active time intervals. Active and mute time intervals should be defined via time_intervals rather than mute_time_intervals (the latter is deprecated but it will be supported until v1.0). #2779
• [FEATURE] Add Telegram integration. #2827
• [ENHANCEMENT] Add update_alerts field to the OpsGenie configuration to update message and description when sending alerts. #2519
• [ENHANCEMENT] Add --cluster.allow-insecure-public-advertise-address-discovery feature flag to enable discovery and use of public IP addresses for clustering. #2719
• [ENHANCEMENT] Add entity and actions fields to the OpsGenie configuration. #2753
• [ENHANCEMENT] Add opsgenie_api_key_file field to the global configuration. #2728
• [ENHANCEMENT] Add support for teams responders to the OpsGenie configuration. #2685
• [ENHANCEMENT] Add the User-Agent header to all notification requests. #2730
• [ENHANCEMENT] Re-enable HTTP/2. #2720
• [ENHANCEMENT] web: Add support for security-related HTTP headers. #2759
• [ENHANCEMENT] amtool: Allow filtering of silences by createdBy author. #2718
• [ENHANCEMENT] amtool: add --http.config.file flag to configure HTTP settings. #2764
• [BUGFIX] Fix HTTP client configuration for the SNS receiver. #2706
• [BUGFIX] Fix unclosed file descriptor after reading the silences snapshot file. #2710
• [BUGFIX] Fix field names for mute_time_intervals in JSON marshaling. #2765
• [BUGFIX] Ensure that the root route doesn't have any matchers. #2780
• [BUGFIX] Truncate the message's title to 1024 chars to avoid hitting Slack limits. #2774
• [BUGFIX] Fix the default HTML email template (email.default.html) to match with the canonical source. #2798
• [BUGFIX] Detect SNS FIFO topic based on the rendered value. #2819
• [BUGFIX] Avoid deleting and recreating a silence when an update is possible. #2816
• [BUGFIX] api/v2: Return 200 OK when deleting an expired silence. #2817
• [BUGFIX] amtool: Fix the silence's end date when adding a silence. The end date is (start date + duration) while it used to be (current time + duration). The new behavior is consistent with the update operation. #2741