runtimes/go: add metrics.SetServiceLabels for per-service label enrichment - #2394
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…tom labels Add metrics.SetServiceLabels(serviceName, labels) which registers additional labels to be included with all metrics exported for a given service. This enables enriching Encore's built-in metrics (like e_requests_total) with custom metadata such as domain, team, or cost-center labels. Labels are stored in the Registry, attached to CollectedMetric at collection time, and applied by each exporter (Prometheus, GCP, Datadog, CloudWatch) when the service name is resolved. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Adding service labels makes sense, nice one!
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Adds
metrics.SetServiceLabels(serviceName, labels)which registers additional labels to be included with all metrics exported for a given service. This enables enriching built-in metrics (likee_requests_total) with custom metadata without duplicating the metric pipeline via OTel.All four exporters are updated (Prometheus, GCP Cloud Monitoring, Datadog, CloudWatch). Reserved keys and empty values are filtered at registration time.