# glowroot/glowroot

Easy to use, very low overhead, Java APM

Repository: https://github.com/glowroot/glowroot
Canonical: https://ross.abutalabs.com/products/glowroot
Homepage: https://glowroot.org
Language: Java
License: Apache-2.0
License Family: permissive
Last push: 2026-08-12T18:09:27+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 71, longevity 100
- inputs: {"age_days": 4599, "days_push": 21, "days_rel": 114, "gap_med": 47, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1355, forks 337 (observed 2026-08-28T04:04:29.208035+00:00)

## What it is
Glowroot is an open-source, very low overhead Java APM (application performance monitoring) tool that installs as a JVM agent. It captures traces, SQL and service call data, response time charts, continuous profiling, and offers optional central collection with a web UI.

## Use cases
- monitor java application performance in production
- find root cause of slow requests and errors
- capture and aggregate SQL query performance
- profile jvm applications continuously
- set up alerting on response time regressions
- self-hosted apm for tomcat or spring apps
- trace async requests across threads

## When to choose
- you need a free, self-hosted APM for Java/JVM applications
- you want minimal overhead instrumentation via a single javaagent flag
- you need SQL, HTTP, and framework-level tracing out of the box
- you want quick setup with a built-in web UI

## When to avoid
- your stack is not on the JVM
- you need APM for polyglot microservices beyond Java
- you require a managed SaaS observability platform
- you need deep frontend/browser performance monitoring

## Facets
- artifact type: application
- maturity: active
- function: monitoring, tracing, alerting, analytics
- domain: monitoring, performance, backend, developer-tools
- platform: jvm, self-hosted
- tags: apm, java-agent, application-performance-monitoring, profiling, low-overhead, observability, devops, web-server

## Member repositories
- glowroot/glowroot (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:29.208035+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 2026-08-30T04:41:57.842260+00:00, confidence not recorded.
  - readme: https://github.com/glowroot/glowroot (fetched 2026-08-28T04:04:29.208035+00:00, sha 1c349855ebd2)
  - homepage: https://glowroot.org (fetched 2026-08-29T12:00:15.615032+00:00, sha 4535c12b8cdf)
  - site_page: https://glowroot.org/features.html (fetched 2026-08-29T12:00:15.617380+00:00, sha 52bb2cdca416)
- Data as of 2026-08-30T08:39:29.467469+00:00.