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Prometheus

prometheus.io

Free plan WebWindowsmacOSLinuxSelf-hosted
Visit prometheus.io
Spec score 7.6 #15 of 31 in Cloud Monitoring

What it is

Prometheus is a free, open-source toolkit for systems monitoring and alerting that collects metrics as time series. Each series is identified by a metric name and key-value labels, and PromQL is used to query the data. Prometheus typically gathers metrics by pulling over HTTP; it can also receive pushed data through an intermediary gateway. Targets can be found with service discovery or configured statically. The main server runs as a standalone monolithic binary without external dependencies, and official components are available as precompiled binaries and Docker images. Its ecosystem includes client libraries, exporters, Pushgateway and Alertmanager, with Grafana for visualization and webhooks for alert notifications. Prometheus and most exporters support TLS, client certificate authentication and HTTP Basic Authentication. The project advises against exposing component HTTP endpoints to public networks without protective measures. Servers do not depend on network storage or remote services, which the project says can help during outages. Prometheus is not recommended for uses requiring 100% accurate data, such as per-request billing.

Spec sheet

What it does
Prometheus is an open-source systems monitoring and alerting toolkit that collects and stores metrics as time series.Read 30 Sep 2026 · prometheus.io
Deployment
Official components have precompiled binaries and Docker images, and the Prometheus download page lists Windows, macOS, and Linux builds.Read 30 Sep 2026 · prometheus.io
Integrations
The ecosystem includes client libraries, exporters, Pushgateway, and Alertmanager; integrations also include Grafana for visualization and webhook-based alert notifications.Read 30 Sep 2026 · prometheus.io
Security
Prometheus and most exporters support TLS, including client certificate authentication, and HTTP Basic Authentication is also supported.Read 30 Sep 2026 · prometheus.io
Support
The project offers community support through channels including Slack, mailing lists, and a Discourse forum, and lists independent commercial support providers separately.Read 30 Sep 2026 · prometheus.io
Founded
2012Read 28 Sep 2026 · prometheus.io
Architecture
The main Prometheus server runs as a standalone monolithic binary without external dependencies.Read 30 Sep 2026 · prometheus.io
Collection
Prometheus collects time series by pulling over HTTP, supports pushing through an intermediary gateway, and discovers targets through service discovery or static configuration.Read 30 Sep 2026 · prometheus.io
Data model
Time series are identified by a metric name and key-value labels, and PromQL provides a flexible query language for querying them.Read 30 Sep 2026 · prometheus.io
Maintenance
Prometheus is maintained by volunteers, and security fixes are handled on a best-effort basis, with a stated aim to release fixes within seven days for several core projects.Read 30 Sep 2026 · prometheus.io
Notable limitation
Prometheus is not recommended for use cases requiring 100% accurate data, such as per-request billing.Read 30 Sep 2026 · prometheus.io
Reliability
Prometheus servers are autonomous and do not depend on network storage or other remote services, which the project says helps make them useful during outages.Read 30 Sep 2026 · prometheus.io
Security guidance
The project advises against exposing Prometheus component HTTP endpoints to publicly accessible networks unless appropriate protective measures are in place.Read 30 Sep 2026 · prometheus.io

Plans and prices

Prometheus Free Open-source monitoring and alerting toolkit · Apache 2.0 license Read 30 Sep 2026 · prometheus.io

Every Prometheus plan and price →

Strong points and limits

Strong points

  • Uses PromQL to query labeled time series.
  • Supports HTTP scraping and Pushgateway.
  • Standalone server has no external dependencies.
  • Supports TLS and HTTP Basic Authentication.

Limits

  • Not recommended for per-request billing accuracy needs.
  • Public HTTP endpoints need protective measures.
  • Security fixes are handled on a best-effort basis.

Who it suits

It suits teams that need open-source metrics collection, querying and alerting, including self-hosted deployments. It is not a fit for uses that require perfectly accurate data, such as per-request billing.

Verdict

Prometheus provides a free monitoring and alerting toolkit with flexible collection and query options. Its own guidance rules it out for applications requiring 100% accurate data.

Where Specifiction places it

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