Graylog

Graylog is an open-source log management platform that enables organizations to collect, index, analyze, and visualize log data from any source at scale. Founded in 2010 by Lennart Koopmann in Hamburg, Germany, Graylog has grown into a widely adopted log management solution with over 7,400 stars as of 2026. Graylog is built on top of Elasticsearch (or OpenSearch) for storage and search, and MongoDB for metadata and configuration, providing a unified platform for log aggregation, search, alerting, and compliance. Key features include: log collection (ingesting log data via GELF, syslog, Beats, CloudWatch, Kafka, AMQP, HTTP/JSON, and raw TCP/UDP inputs, with support for over 50 input plugins), parsing and normalization (extracting and structuring fields from unstructured log messages using extractors, pipeline rules, and GROK patterns), real-time search (searching across millions of log messages with full-text search, field-level filtering, and time-range queries powered by Elasticsearch), dashboards and visualizations (creating interactive charts, graphs, tables, and world maps from log data with drag-and-drop dashboard builder), alerting and notifications (defining alert conditions based on message count, field values, and aggregation thresholds, with notifications via email, Slack, PagerDuty, webhooks, and custom scripts), stream routing (categorizing and routing messages into streams based on rules for targeted analysis and retention), content packs (sharing dashboards, inputs, extractors, and grok patterns as reusable packages), archiving (automatically archiving old log data to S3-compatible storage for long-term retention and compliance), security (role-based access control, LDAP and Active Directory integration, audit logging, and TLS encryption), REST API (for programmatic access to all Graylog functionality), and cluster deployment (multi-node clusters with load balancing and failover for high availability).