feat(alertmanager): add custom headers to alert manager #827
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What type of PR is this?
/kind bug
Any specific area of the project related to this PR?
/area outputs
What this PR does / why we need it:
Follow on from #826 - fix the use of environment variables for custom headers.
Special notes for your reviewer:
I believe this is also an issue when using Grafana custom headers, and others that support custom headers (except webhook).