Value Statement

By upgrading the prometheus-alertmanager, users can use the latest release build from the upstream project within ACM.

Definition of Done for Engineering Story Owner (Checklist)

• [x] prometheus-alertmanager repo is upgraded from v0.21.0 to v0.25.0.
• [x] prometheus-alertmanager is able to be used without any regression.

Development Complete

• The code is complete.
• Functionality is working.
• Any required downstream Docker file changes are made.

Tests Automated

• [x] Unit/function tests have been automated and incorporated into the
  build.
• [ ] 100% automated unit/function test coverage for new or changed APIs.

Multidisciplinary Teams Readiness

• [x] Create an informative documentation issue using the [Customer
  Portal_doc_issue template](
  https://github.com/stolostron/backlog/issues/new?assignees=&labels=squad%3Adoc&template=doc_issue.md&title=),
  and ensure doc acceptance criteria is met. Link the development issue to
  the doc issue.
• [x] Provide input to the QE team, and ensure QE acceptance criteria
  (established between story owner and QE focal) are met.