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fix(target-health): omit target metrics family when unconfigured

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writeTargetMetrics now returns before emitting even
llmgateway_target_healthy's own HELP/TYPE header when neither an
MCP server nor an agent is configured, mirroring
writeStoreHealthMetrics' identical behaviour when Redis is
unconfigured.

Claude-Session: https://claude.ai/code/session_01EebV5jyWvYocByNQ3oss1w
This commit is contained in:
lukaszraczylo
2026-09-03 02:47:25 +01:00
parent f5d9014b13
commit 10d1825ed7
3 changed files with 63 additions and 1 deletions
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metrics.go
+8
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@@ -694,7 +694,15 @@ func (g *Gateway) writeProviderMetrics(m *metricWriter) {
// unreadable". Iterates every CONFIGURED MCP server and agent (not just
// ones the tracker happens to have an entry for), so a target removed
// from config since its last observation contributes no stale series.
// F7, feat/target-health review: returns before emitting even the family's
// own HELP/TYPE header when no MCP server or agent is configured at all —
// mirrors writeStoreHealthMetrics' identical "nothing to report, no family
// either" early return above, rather than a HELP/TYPE line promising a
// metric family that can never carry a sample in this deployment.
func (g *Gateway) writeTargetMetrics(m *metricWriter) {
if len(g.cfg.MCPServers) == 0 && len(g.cfg.Agents) == 0 {
return
}
m.family("llmgateway_target_healthy", "gauge",
"1 when an MCP server or A2A agent's health (last passive observation or active probe) is healthy, 0 when its consecutive-failure count has reached targetHealth.failureThreshold. No sample while never yet observed."+aggregationNoteTargetHealthy)