# riemann/riemann

A network event stream processing system, in Clojure.

Repository: https://github.com/riemann/riemann
Canonical: https://ross.abutalabs.com/products/riemann
Homepage: https://riemann.io
Language: Clojure
License: EPL-1.0
License Family: copyleft
Topics: riemann, events, clojure, monitoring, logging, metrics, monitoring-tool
Last push: 2026-04-05T20:42:18+00:00

## Health v2 (maintenance only)
Score: 57/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 75, release rhythm 8, longevity 100
- inputs: {"age_days": 5320, "days_push": 150, "days_rel": 464, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4268, forks 503 (observed 2026-08-28T04:08:40.743609+00:00)

## What it is
Riemann is a network event stream processing system written in Clojure that aggregates events from servers and applications. It provides a powerful stream processing language for filtering, combining, and acting on events, with low-latency shared state and alerting via email, SMS, and phone.

## Use cases
- aggregate metrics and events from distributed servers
- send email alerts for application exceptions
- track latency distributions of web apps
- monitor CPU and memory of top processes across hosts
- forward cluster statistics to Graphite
- build dashboards showing system health at a glance

## When to choose
- you need low-latency event stream processing for monitoring distributed systems
- you want configuration-as-code with a flexible, expressive stream language
- you need throttled or rolled-up alerts from many event sources

## When to avoid
- you want a turnkey monitoring solution with minimal configuration
- your team is not comfortable with Clojure-based configuration
- you need long-term metric storage rather than transient state

## Facets
- artifact type: service
- maturity: stable
- function: monitoring, alerting, streaming, logging, analytics
- domain: monitoring, microservices, infrastructure-as-code
- platform: jvm, self-hosted
- tags: event-stream-processing, metrics, clojure, time-series, alerting, dashboards, devops, linux, web-server

## Member repositories
- riemann/riemann (main) score 57

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:40.743609+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:02.580422+00:00, confidence not recorded.
  - readme: https://github.com/riemann/riemann (fetched 2026-08-28T04:08:40.743609+00:00, sha 593f56b91142)
  - homepage: https://riemann.io (fetched 2026-08-29T09:11:33.162269+00:00, sha 980fe32cde35)
  - site_page: https://riemann.io/quickstart.html (fetched 2026-08-29T09:11:33.164794+00:00, sha 27dbaef35214)
- Data as of 2026-08-30T08:39:29.467469+00:00.