fix(server): initialize prometheus headers map to avoid nil map panic#820
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fix(server): initialize prometheus headers map to avoid nil map panic#820SAY-5 wants to merge 2 commits into
SAY-5 wants to merge 2 commits into
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The server command's --prometheus-header flag panicked with "assignment to entry in nil map" because the backing map was never initialized, unlike the equivalent --extra-labels flag in other commands. Initialize it in NewServerCommand and add a regression test.
…us-header-nil-map-panic Signed-off-by: Sai Asish Y <say.apm35@gmail.com> # Conflicts: # CHANGELOG.md
robbat2
approved these changes
Jun 2, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #820 +/- ##
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+ Coverage 31.30% 31.54% +0.23%
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Files 149 149
Lines 9228 9229 +1
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+ Hits 2889 2911 +22
+ Misses 6088 6067 -21
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Fixes #819.
sloth server --prometheus-header='k=v'panicked withassignment to entry in nil mapbecauseserverCommand.prometheus.headerswas passed toStringMapVarwhile still nil. The equivalent--extra-labelsflag ingenerate/validate/k8scontrollerworks because those commands initialize the map (&generateCommand{extraLabels: map[string]string{}});serverdid not.Initializes the map in
NewServerCommandand adds a regression test that parsesserver --prometheus-header=...and asserts no panic (fails before the fix, passes after).go build ./...,go vet ./cmd/...and the new test pass locally.