owl

owl is a tiny self-hosted observability tool. One static Go binary, one container, one SQLite file. Built for a single low-end host where Prometheus + Grafana is too heavy and a SaaS funnel is the wrong shape.

It scrapes Prometheus-format /metrics endpoints, stores time series in embedded SQLite, evaluates a useful PromQL subset, and renders dashboards defined as Grafana-compatible JSON. The container image sits around 12 MB; idle RAM stays under 20 MB.

Owl

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Start here

  • Getting Started — pull the image, see the bundled Owl Health dashboard within a scrape interval.
  • Configuration — every YAML field, where it can be overridden, what reloads live.
  • PromQL — the supported subset, function by function.
  • /metrics — owl's own metrics, scraped by owl by default.

What it is not

owl is not Prometheus, not Grafana, not Datadog, not Netdata. There is no SaaS, no cloud sign-in, no telemetry, no agent fleet. There is no SPA, no build pipeline, no CDN. A YAML file, a directory of JSON dashboards, a binary that runs in a distroless container — that is the whole shape of it.