bare-prom-client

bare-prom-client is a Prometheus metrics client for Bare, modelled on the popular prom-client package. It's pure JavaScript and bundles no web framework—you expose metrics by responding to Prometheus scrapes with await registry.metrics().

npm i bare-prom-client

API overview

Metrics register against a Registry (a default registry is provided). The four metric types are:

• Counter— a value that only increases (requests served, errors seen).
• Gauge— a value that goes up and down (in-flight requests, queue depth).
• Histogram— sampled observations bucketed by configurable boundaries (request durations).
• Summary— observations summarized as configurable quantiles.

Each type takes a configuration object (name, help text, label names) and supports labelled series, zeroing, reset, and removal. Expose the registry's current values in Prometheus exposition format with await registry.metrics(); for Node-style cluster deployments, aggregate worker registries in the master process. See the repository README and its example/ directory for the full configuration and method surface.

See also

• Bare modules—the full bare-* catalog.
• bare-http1—serve the metrics endpoint.
• Bare runtime API—the runtime this runs on.