# google/flogger

A Fluent Logging API for Java

Repository: https://github.com/google/flogger
Canonical: https://ross.abutalabs.com/products/flogger
Homepage: https://google.github.io/flogger/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: logging
Last push: 2026-08-25T18:17:55+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 3065, "days_push": 8, "days_rel": 474, "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 1480, forks 131 (observed 2026-08-28T04:04:50.783011+00:00)

## What it is
Flogger is a fluent logging API for Java developed by Google, designed as a unified replacement for the many logging APIs used across large codebases. It offers near-zero cost for disabled log statements, high performance for enabled ones, and an extensible fluent interface that produces self-documenting log calls.

## Use cases
- replace slf4j or java.util.logging in a Java project
- add high-performance debug logging without overhead
- write self-documenting log statements with fluent API
- rate-limit expensive log statements
- unify logging APIs across a large multi-project codebase

## When to choose
- you want a modern, performant logging API for JVM code
- you need cheap disabled-level logging with many fine-grained statements
- you want extensible logging features without multiple façades

## When to avoid
- you are locked into an existing logging framework with heavy integration
- you work in a non-JVM language
- you need a logging backend itself rather than an API façade

## Facets
- artifact type: library
- maturity: stable
- function: logging
- domain: developer-tools, backend
- platform: jvm
- tags: fluent-api, logging-facade, java

## Member repositories
- google/flogger (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:50.783011+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 2026-08-30T04:34:14.601941+00:00, confidence not recorded.
  - readme: https://github.com/google/flogger (fetched 2026-08-28T04:04:50.783011+00:00, sha d7384fbd0c06)
  - homepage: https://google.github.io/flogger/ (fetched 2026-08-29T11:41:01.232590+00:00, sha ae2883e40ad7)
- Data as of 2026-08-30T08:39:29.467469+00:00.