Files
homelab-frontend/internal/observability/handler.go
T
Admin Bot 44ec3502dc
CI / CI (pull_request) Failing after 2m13s
feat: add TTFT/ITL metrics for LLM inference
- RecordTTFT: Time-to-First-Token in milliseconds
- RecordITL: Inter-Token Latency in milliseconds
- RecordTokenCount: Track total tokens generated
- Prometheus exporter for /metrics endpoint
- Grafana dashboard ConfigMap (llm-metrics.json)
- ResponseWriterWrapper to capture metrics during LLM calls
- Metrics exported: llm_ttft_seconds, llm_itl_seconds, llm_tokens_total
2026-09-14 22:33:32 +09:00

29 lines
762 B
Go

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