# logstash-plugins/logstash-patterns-core

Repository: https://github.com/logstash-plugins/logstash-patterns-core
Canonical: https://ross.abutalabs.com/products/logstash-patterns-core
Language: Ruby
License: Apache-2.0
License Family: permissive
Last push: 2026-07-29T23:39:29+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 95, release rhythm 35, longevity 100
- inputs: {"age_days": 4322, "days_push": 35, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2186, forks 961 (observed 2026-08-28T04:06:23.684619+00:00)

## What it is
A Logstash plugin providing the built-in grok pattern definitions used to parse unstructured log data into structured fields. It ships the canonical regex pattern library that the Logstash grok filter matches against.

## Use cases
- parse apache or nginx access logs into fields
- extract structured data from syslog messages
- write custom grok patterns for application logs
- parse timestamps and log levels from raw log lines
- normalize heterogeneous log formats in an ELK stack

## When to choose
- you use Logstash's grok filter and need its standard pattern library
- you want to define custom grok patterns alongside the built-in ones
- you are building log ingestion pipelines in the Elastic Stack

## When to avoid
- you parse logs outside of Logstash and just want a standalone grok library
- you need a general-purpose regex tool rather than log pattern definitions
- you use a log processor with its own parsing DSL like Fluentd or Vector

## Facets
- artifact type: plugin
- maturity: stable
- function: parser, logging, developer-tools
- domain: developer-tools, monitoring
- platform: jvm, ruby, self-hosted
- tags: logstash, grok, regex-patterns, log-parsing, elastic-stack, data-engineering

## Member repositories
- logstash-plugins/logstash-patterns-core (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:23.684619+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 2026-08-30T02:47:54.790322+00:00, confidence not recorded.
  - readme: https://github.com/logstash-plugins/logstash-patterns-core (fetched 2026-08-28T04:06:23.684619+00:00, sha 2be8ef657271)
- Data as of 2026-08-30T08:39:29.467469+00:00.