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Prometheus
What it is
Prometheus is an open-source monitoring and alerting toolkit that collects system metrics and stores them as time series. Each series is defined by a metric name and key-value labels, and PromQL lets users query that data. Collection typically pulls metrics over HTTP; Prometheus can also receive data through an intermediary gateway. Targets can be identified through service discovery or entered through static configuration. The main server runs as a standalone monolithic binary without external dependencies. Its ecosystem includes client libraries, exporters, Pushgateway, Alertmanager, Grafana visualization, and webhook-based alert notifications. Official components are available as precompiled binaries and Docker images, with builds for Windows, macOS, and Linux. Prometheus and most exporters support TLS, client certificate authentication, and HTTP Basic Authentication. The project advises against leaving component endpoints publicly accessible without protective measures. Its servers operate independently of remote services and network storage, which can help during outages. Prometheus is free and supports Linux, macOS, Windows, web, and self-hosted use.
For and against
For
- Free and open source.
- Queries time series with PromQL.
- Supports HTTP scraping and Pushgateway.
- Standalone server has no external dependencies.
- Supports TLS and HTTP Basic Authentication.
Against
- Not recommended for 100% accurate data use cases.
- Public endpoints need protective measures.
- Horizontal scaling is not supported.
The verdict
Prometheus offers a self-contained approach to metrics collection, querying, and alerting with a broad ecosystem of related components. Its stated accuracy limitation matters for applications such as per-request billing.
Who it suits
Prometheus suits teams that need to collect and query system metrics or set up alerts. It may be less suitable for workloads that require fully accurate per-request data, such as billing.
Plans and prices
Prometheus
Open-source monitoring and alerting toolkit · Apache 2.0 license
Read 30 Sep 2026 · prometheus.io
On the record
- Architecture
- The main Prometheus server runs as a standalone monolithic binary without external dependencies.prometheus.io · read 30 Sep 2026
- Collection
- Prometheus collects time series by pulling over HTTP, supports pushing through an intermediary gateway, and discovers targets through service discovery or static configuration.prometheus.io · read 30 Sep 2026
- Data model
- Time series are identified by a metric name and key-value labels, and PromQL provides a flexible query language for querying them.prometheus.io · read 30 Sep 2026
- Deployment
- Official components have precompiled binaries and Docker images, and the Prometheus download page lists Windows, macOS, and Linux builds.prometheus.io · read 30 Sep 2026
- Integrations
- The ecosystem includes client libraries, exporters, Pushgateway, and Alertmanager; integrations also include Grafana for visualization and webhook-based alert notifications.prometheus.io · read 30 Sep 2026
- 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.prometheus.io · read 30 Sep 2026
- Notable limitation
- Prometheus is not recommended for use cases requiring 100% accurate data, such as per-request billing.prometheus.io · read 30 Sep 2026
- 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.prometheus.io · read 30 Sep 2026
- Security
- Prometheus and most exporters support TLS, including client certificate authentication, and HTTP Basic Authentication is also supported.prometheus.io · read 30 Sep 2026
- Security guidance
- The project advises against exposing Prometheus component HTTP endpoints to publicly accessible networks unless appropriate protective measures are in place.prometheus.io · read 30 Sep 2026
- Support
- The project offers community support through channels including Slack, mailing lists, and a Discourse forum, and lists independent commercial support providers separately.prometheus.io · read 30 Sep 2026
- What it does
- Prometheus is an open-source systems monitoring and alerting toolkit that collects and stores metrics as time series.prometheus.io · read 30 Sep 2026
