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Grafana Loki

grafana.com

From $19/mo Free plan Open source WebWindowsLinuxAPISelf-hosted
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Spec score 9.4 #3 of 111 in Log Management Software

What it is

Grafana Loki is a free, AGPLv3-licensed log aggregation system for storing and querying application and infrastructure logs. It can be self-hosted on Linux or accessed through Grafana Cloud Logs plans, with API support and live log tailing. Loki scales horizontally, supports high availability and multiple tenants, and indexes labels instead of log-line contents. LogQL provides queries in Grafana or the LogCLI command-line tool. Grafana describes object-storage support for high-throughput, durable, petabyte-scale retention. Loki can evaluate alerting rules on incoming logs and send results to Prometheus Alertmanager, with native integrations for Prometheus, Grafana, and Kubernetes. Documented ingestion options include Grafana Alloy, OpenTelemetry, Kubernetes Monitoring Helm, Docker, Fluent Bit, Fluentd, and Logstash. Installation methods include Helm, Tanka, Docker, Docker Compose, local installation, and source builds. Cloud plans range from free to paid Pro and Enterprise options.

Spec sheet

What it does
Grafana Loki is a horizontally scalable, highly available, multi-tenant system for collecting, storing and querying logs.Read 15 Oct 2026 · grafana.com
Purpose
Loki is a log aggregation system designed to store and query logs from applications and infrastructure.Read 11 Oct 2026 · grafana.com
Deployment options
self-hostedRead 24 Sep 2026 · grafana.com
Free plan
YesRead 24 Sep 2026 · grafana.com
Integrations
Official documentation lists Grafana Alloy as the recommended collector and describes OpenTelemetry, Promtail, Fluent Bit, Fluentd, Vector, Logstash and other clients.Read 15 Oct 2026 · grafana.com
Support
Grafana directs Loki users to its community forum, Grafana Labs Slack, and the Loki project email for help.Read 11 Oct 2026 · grafana.com
License
Grafana states that Loki is released under the GNU Affero General Public License version 3.Read 15 Oct 2026 · grafana.com
Alerting
The Loki ruler evaluates log queries continuously and integrates with Prometheus Alertmanager or Grafana alerting.Read 15 Oct 2026 · grafana.com
Architecture
Loki is horizontally scalable, highly available, and multi-tenant, and it indexes labels rather than the contents of log lines.Read 11 Oct 2026 · grafana.com
Authentication limit
Loki does not include an authentication layer, so Grafana instructs users to put an authenticating reverse proxy in front of its services.Read 11 Oct 2026 · grafana.com
Authentication limitation
Loki ships without an authentication layer, so operators must place an authenticating reverse proxy in front of it.Read 15 Oct 2026 · grafana.com
Compressed storage
Log contents are compressed into chunks stored in object storage such as Amazon S3, Google Cloud Storage, Azure Blob Storage or a local filesystem.Read 15 Oct 2026 · grafana.com
Documentation depth
The documentation covers architecture, deployment modes, configuration, ingestion clients, operations, multi-tenancy, LogQL, APIs, troubleshooting, upgrades and release notes.Read 15 Oct 2026 · grafana.com
Grafana integration
Grafana has built-in Loki support, so a separate data-source plugin is not required.Read 15 Oct 2026 · grafana.com
HTTP API
The public HTTP API supports log push, OTLP ingestion, instant and range queries, tailing, labels, rules, deletion and cluster status endpoints.Read 15 Oct 2026 · grafana.com
Independent assessment
Thoughtworks’ 2025 Technology Radar says Loki reduces operational complexity and storage costs, integrates tightly with Grafana and Alloy, and added native OpenTelemetry support in version 3.0.Read 15 Oct 2026 · thoughtworks.com
Installation
Grafana documents installation using Helm, Tanka, Docker or Docker Compose, local installation, and source builds.Read 11 Oct 2026 · grafana.com
Label cardinality
Grafana warns that high-cardinality labels can significantly reduce Loki performance and cost-effectiveness.Read 11 Oct 2026 · grafana.com
Label-based indexing
Loki indexes stream labels and metadata instead of indexing the full text of each log line.Read 15 Oct 2026 · grafana.com
License and project history
Loki is released under AGPLv3, and Grafana says the project started at Grafana Labs in 2018.Read 11 Oct 2026 · grafana.com
Limit: full-text search
Independent analysis says ad-hoc full-text searches over large time ranges can be slower than Elasticsearch or Splunk because Loki filters labels before scanning log contents.Read 15 Oct 2026 · modern-datatools.com
Limit: label discipline
Reviewers warn that high-cardinality or poorly chosen labels can cause slow queries, large scans and production performance problems.Read 15 Oct 2026 · modern-datatools.com
Limit: learning curve
TrustRadius reviewers report a steep learning curve, difficulty with long-term log insight and a need for better query suggestions and syntax checking.Read 15 Oct 2026 · trustradius.com
Limit: operational complexity
Independent review coverage says production deployments commonly involve six or more independently scaling components and require Kubernetes expertise.Read 15 Oct 2026 · modern-datatools.com
Limit: reporting and forensics
Independent guidance says Loki is weak for immutable audit trails, scheduled reports, PDF or spreadsheet exports, broad forensic searches and compliance-heavy reporting.Read 15 Oct 2026 · datavire.com
Live log tailing
YesRead 24 Sep 2026 · grafana.com
Log pipelines
YesRead 24 Sep 2026 · grafana.com
Log shippers
The documentation describes sending logs using Grafana Alloy, OpenTelemetry, Kubernetes Monitoring Helm, Docker, Fluent Bit, Fluentd, and Logstash.Read 11 Oct 2026 · grafana.com
LogQL
LogQL is Loki’s PromQL-inspired query language and can also derive metrics from log data.Read 15 Oct 2026 · grafana.com
Maker founded
Grafana Labs is listed as founded in 2014.Read 15 Oct 2026 · g2.com
Maker funding news
Grafana Labs announced an approximately $270 million primary and secondary financing transaction on August 21, 2024, at a valuation above $6 billion.Read 15 Oct 2026 · grafana.com
Multi-tenancy
Tenant isolation uses an X-Scope-OrgID request header and is enabled by default through auth_enabled=true.Read 15 Oct 2026 · grafana.com
Praise: cost and openness
Independent reviewers describe self-hosted Loki as free and cost-efficient because its label-only index reduces storage and indexing expense.Read 15 Oct 2026 · openmsp.ai
Praise: dashboards and usability
G2 reviewers repeatedly praise easy dashboard creation, clear visualization, real-time monitoring and flexible integrations.Read 15 Oct 2026 · g2.com
Praise: integrations
TrustRadius reviewers praise AWS integration, broad integration options and notifications reaching the intended destinations.Read 15 Oct 2026 · trustradius.com
Query language
LogQL lets users explore logs in Grafana or through the LogCLI command-line tool.Read 11 Oct 2026 · grafana.com
Rating on G2
219 reviews are listed for Grafana Labs, the maker of Loki; the profile shows 155 five-star, 62 four-star, 1 three-star and 1 one-star review counts.Read 15 Oct 2026 · g2.com
Rating on Gartner Peer Insights
4.6 out of 5 from 348 ratings for Grafana Cloud, the managed Loki platformRead 15 Oct 2026 · gartner.com
Rating on TrustRadius
8.1 out of 10 from 21 reviewsRead 15 Oct 2026 · trustradius.com
Rating on TrustRadius pricing page
7.9 out of 10 from 19 reviewsRead 15 Oct 2026 · trustradius.com
Release news
Loki 3.7.0 was released on March 26, 2026; its release notes say the community Helm-chart repository took over chart maintenance effective March 16, 2026.Read 15 Oct 2026 · grafana.com
Scalability modes
Loki can run as a single binary, in high-availability monolithic mode or as independently scalable microservices for Kubernetes deployments.Read 15 Oct 2026 · grafana.com
SDKs
The API documentation links a Go client library and Protocol Buffer definition for push requests and provides Python query examples.Read 15 Oct 2026 · grafana.com
Security and compliance
Grafana Labs’ trust center lists SOC 2, ISO/IEC 27001, PCI DSS 4.0.1, GDPR, FedRAMP High and other attestations for its services.Read 15 Oct 2026 · trust.grafana.com
Security certifications
Grafana Labs lists ISO 27001, SOC 2 Type 2, PCI compliance for its corporate environment, and a GDPR data processor agreement.Read 11 Oct 2026 · grafana.com
Self-hosting
Local installation instructions provide Linux and Windows binaries and a downloadable configuration file, with Docker, package-manager and Helm deployment paths documented.Read 15 Oct 2026 · grafana.com
Storage
Grafana says Loki stores logs in object storage for petabyte scale, high throughput, and durable storage.Read 11 Oct 2026 · grafana.com
Structured log parsing
YesRead 24 Sep 2026 · grafana.com
System requirements
The local quickstart requires Docker and Docker Compose for its sample stack, while standalone binaries are supplied for Linux and Windows.Read 15 Oct 2026 · grafana.com
Visualization
Loki has no built-in user interface; users normally explore and visualize it through Grafana Explore, dashboards and Logs Drilldown.Read 15 Oct 2026 · grafana.com

Plans and prices

Grafana Cloud Logs Free Free always free 50 GB ingested/month · 14-day retention · community support Read 15 Oct 2026 · grafana.com
Grafana Loki OSS self-hosted Free free open-source software self-administered installation Read 15 Oct 2026 · grafana.com
Loki (self-hosted) Free AGPLv3 open-source project; self-managed No price stated on the Loki product page Read 11 Oct 2026 · grafana.com
Grafana Cloud Logs Pro $19 a month $19/month + usage 50 GB included then usage billing · 30-day retention · 8×5 email support · $0.050/GB process · $0.400/GB write · $0.100/GB retain Read 15 Oct 2026 · grafana.com
Grafana Cloud Logs Enterprise Price not published minimum $25,000/year spend commit custom retention · premium support · public cloud, federal cloud or bring-your-own-cloud deployment Read 15 Oct 2026 · grafana.com

Every Grafana Loki plan and price →

Strong points and limits

Strong points

  • Horizontally scalable and multi-tenant architecture
  • LogQL queries in Grafana or LogCLI
  • Object storage supports durable, high-throughput retention
  • Alerting rules can notify Prometheus Alertmanager
  • Many documented shippers and installation methods

Limits

  • No built-in authentication layer
  • High-cardinality labels can reduce performance and cost-effectiveness
  • Self-hosted deployment requires management
  • Cloud Pro and Enterprise plans add paid costs

Who it suits

It suits teams operating application or infrastructure logs that want label-based indexing, LogQL queries, alerting, and integrations with Grafana ecosystems. Self-hosting fits organizations managing their own deployment; Cloud Logs plans provide hosted alternatives.

Verdict

Loki offers a broad log-collection and querying stack with self-hosted and hosted paths. Its missing authentication layer and sensitivity to label cardinality are key deployment considerations.

Where Specifiction places it

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