chore(deps): update prom/alertmanager docker tag to v0.31.1

[renovate]

This PR contains the following updates:

Package	Update	Change
prom/alertmanager	minor	v0.30.0 → v0.31.1

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Release Notes

prometheus/alertmanager (prom/alertmanager)

v0.31.1: 0.31.1 / 2026-02-11

Compare Source

• [BUGFIX] docs: Fix email TLS configuration example. #​4976
• [BUGFIX] docs: Add telegram bot token options to global config docs. #​4999

v0.31.0: 0.31.0 / 2026-02-02

Compare Source

• [ENHANCEMENT] docs(opsgenie): Fix description of api_url field. #​4908
• [ENHANCEMENT] docs(slack): Document missing app configs. #​4871
• [ENHANCEMENT] docs: Fix max-silence-size-bytes. #​4805
• [ENHANCEMENT] docs: Update expr for AlertmanagerClusterFailedToSendAlerts to exclude value 0. #​4872
• [ENHANCEMENT] docs: Use matchers for inhibit rules examples. #​4131
• [ENHANCEMENT] docs: add notification integrations. #​4901
• [ENHANCEMENT] docs: update slack_config attachments documentation links. #​4802
• [ENHANCEMENT] docs: update description of filter query params in openapi doc. #​4810
• [ENHANCEMENT] provider: Reduce lock contention. #​4809
• [FEATURE] slack: Add support for top-level text field in slack notification. #​4867
• [FEATURE] smtp: Add support for authsecret from file. #​3087
• [FEATURE] smtp: Customize the ssl/tls port support (#​4757). #​4818
• [FEATURE] smtp: Enhance email notifier configuration validation. #​4826
• [FEATURE] telegram: Add chat_id_file configuration parameter. #​4909
• [FEATURE] telegram: Support global bot token. #​4823
• [FEATURE] webhook: Support templating in url fields. #​4798
• [FEATURE] wechat: Add config directive to pass api secret via file. #​4734
• [FEATURE] provider: Implement per alert limits. #​4819
• [BUGFIX] Allow empty group_by to override parent route. #​4825
• [BUGFIX] Set spellcheck=false attribute on silence filter input. #​4811
• [BUGFIX] jira: Fix for handling api v3 with ADF. #​4756
• [BUGFIX] jira: Prevent hostname corruption in cloud api url replacement. #​4892

v0.30.1: 0.30.1 / 2026-01-12

Compare Source

• [BUGFIX] Fix memory leak in tracing client. #​4828

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