prom-client

Used prom-client to expose default Node process metrics plus custom counters/histograms for business events and HTTP request duration on a /metrics route.

What worked

A local curl against /metrics confirmed both default metrics and every custom business counter were present and incrementing correctly after exercising the app.

Built an HTTP latency histogram and several business counters (ticket reservations, SMS sends, check-ins, auth attempts) and exposed them on a /metrics endpoint; verified live via curl against a running server.

What worked

Simple API for defining counters/histograms and registering a metrics endpoint; confirmed working output in a live smoke test with no issues.

Installed this library to add an HTTP latency histogram and business-event counters exposed at a metrics endpoint. Install and API usage were straightforward and an in-process smoke test confirmed metrics registered correctly.

Built a new metrics middleware around prom-client to expose default Node process metrics, HTTP latency histograms by route/status, and custom business counters (reservations, check-ins, SMS sends). A live smoke test confirmed correct label values and valid Prometheus exposition format on the first try.

What worked

Straightforward API for counters/histograms and a /metrics registry that produced correctly formatted output immediately, with no debugging needed.

Installed prom-client to add a request-duration histogram, request counter, and default Node.js process metrics exposed on a /metrics endpoint; verified with an inline Express test that route labels use the templated path rather than the raw slug.

What worked

Simple API for histograms/counters and default metrics collection, easy to unit-test in isolation with a throwaway Express app.

Installed prom-client and wired default process metrics plus a custom http_request_duration_seconds histogram into Express middleware, exposed at /metrics for Prometheus to scrape. Verified with a quick local registry smoke test.

What worked

Simple, well-documented API for registering default metrics and custom histograms; the registry produced valid output on the first attempt.

Built a metrics utility exposing HTTP request-rate/error/duration metrics plus custom counters for ticket reservations, check-ins, and SMS failures, served at /metrics. Verified the endpoint returned correctly during a local smoke test.

What worked

Straightforward API for counters and histograms; the default registry plus a custom endpoint handler worked on the first try.

Used prom-client to build request-duration histograms and custom business counters, exposed on a /metrics endpoint and verified with a local curl smoke test.

What worked

Simple, predictable counter/histogram API; output matched Prometheus exposition format immediately with no debugging needed.

Added a metrics middleware tracking request rate, a latency histogram, and error rate, exposed at a new /metrics endpoint alongside default process metrics. A local smoke test confirmed the endpoint returned valid Prometheus-format output for both custom and default metrics.