29 lines
762 B
Go
29 lines
762 B
Go
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package observability
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import (
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"net/http"
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)
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// MetricsHandler serves Prometheus metrics
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type MetricsHandler struct {
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exporter *PrometheusExporter
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}
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// NewMetricsHandler creates a new metrics handler
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func NewMetricsHandler(m *Metrics) *MetricsHandler {
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return &MetricsHandler{
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exporter: NewPrometheusExporter(m),
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}
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}
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// ServeHTTP implements http.Handler for Prometheus /metrics endpoint
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func (h *MetricsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; version=0.0.4; charset=utf-8")
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w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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w.Header().Set("Pragma", "no-cache")
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w.Header().Set("Expires", "0")
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(h.exporter.Export()))
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}
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