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Grafana Loki — aggregate and query logs with Prometheus-style labels

OSS scale score 313.7OSS health 96Update pace 367 commits/30d
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Stars
28,916
Primary language
Go
License
AGPL-3.0
Repository last updated
Sep 19, 2026

Overview

Grafana Loki is a log aggregation system that stores compressed log data while indexing labels for each log stream rather than full-text indexing every line. It shares a label-oriented model with Prometheus and integrates natively with Grafana, making it especially useful for Kubernetes logging and unified observability workflows.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Filter logs through labels instead of full-text indexing

Loki stores compressed unstructured logs and indexes stream metadata, reducing the indexing footprint compared with systems that index complete log contents.

Sources: [2]

Connect metrics and logs through Prometheus-style labels

Kubernetes metadata such as Pod labels can classify streams, and Grafana can use related labels to move between metric investigation and logs.

Sources: [2]

For Kubernetes-centric observability stacks

Loki fits environments already using Grafana, Prometheus-style metrics, and Kubernetes metadata that want logs integrated into the same investigation workflow.

Sources: [2][4]

Check the current collector and Helm chart paths

The README states that Promtail is feature complete and future log-collection development is centered on Grafana Alloy. It also notes that the OSS Loki Helm chart moved to grafana-community/helm-charts on March 16, 2026.

Sources: [2]

Official sources

  1. [1]grafana/loki repository(2026-09-20)
  2. [2]Grafana Loki README(2026-09-20)
  3. [3]Grafana Loki AGPL-3.0-only license(2026-09-20)
  4. [4]Grafana Loki documentation(2026-09-20)
Supplemental curator note

Loki is worth evaluating when you want Prometheus-style labels for logs without full-text indexing every line. Grafana Alloy is now the forward path for log collection, and label design should be deliberate to avoid operational and query problems.

Try it in 3 steps

  1. 1

    Clone the Loki source

    Use the README single-host path to try Loki itself without a distributed deployment first.

    git clone https://github.com/grafana/loki.git && cd loki
  2. 2

    Build the Loki binary

    Build the local Loki executable using the source-build command documented in the README.

    go build ./cmd/loki
  3. 3

    Run the local configuration

    Start Loki, send some logs, then inspect labels and queries through Grafana or LogCLI.

    ./loki -config.file=./cmd/loki/loki-local-config.yaml
Check the official README

Growth

Growth trends · Last 30 days

28,916 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
367
Open PRs
438
Issues opened
58
Issues closed
271
PRs opened
2,087
PRs merged
1,309

Issues

58 / 271

Jun 23Sep 20
Issues openedIssues closed

Pull requests

2,087 / 1,309

Jun 23Sep 20
PRs openedPRs merged

Maintenance

Median first response
Not specified
Issue response rate
0% (0/56)

Based on up to the 100 newest issues opened by external users in the last 90 days. A first comment from an OWNER, MEMBER, or COLLABORATOR counts as a response; issues whose full comment history cannot be checked are excluded. The median and response rate update weekly.

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GitHub data

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GitHub Topics

  • loki
  • grafana
  • prometheus
  • logging
  • cloudnative
  • hacktoberfest
Stars
28,916
Forks
4,113
Watchers
387
Open issues
1,082
Contributors
447
Primary language
Go
License
AGPL-3.0
Repository last updated
Sep 19, 2026
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