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Prometheus

✓ Verified FOSSApache-2.0
Top open-source alternative to Datadog
⭐ 66,517 StarsOfficial Website ↗

The Prometheus monitoring system and time series database.

Tech StackGo
Self-Host DifficultyMedium
License ModelApache-2.0
GitHub Repositoryprometheus/prometheus

Recommended VPS & Hardware Sizing

Estimated Hosting: $10 - $15/mo (e.g. Hetzner CPX21 or Linode)
Min RAM:2 GB
Rec RAM:4 GB
Compute:2 vCPU
Disk Space:25 GB SSD

Prometheus vs Datadog Comparison Matrix

Evaluation CriteriaPrometheus (Open Source)Datadog (Proprietary)
Metric Ingestion BillRuns locally on commodity NVMe diskPer-million metric point fee spikes
INTERACTIVE TCO MODELEstimated Rate: $19/user/mo

Financial Impact: Migrating from Datadog to Self-Hosted Prometheus

Detailed Stack Calculator →
5 Users (Early Startup)50 Users (Scaleup)200 Users (Enterprise Org)
Datadog (Cloud SaaS)Per-Seat Tax
$5,700per year ($475/mo)
3-Year Spend:$17,100

* Excludes enterprise SSO add-ons & usage overages

Prometheus (Self-Hosted)Zero Per-Seat Fee
$120per year ($10/mo Linux VPS)
3-Year Compute:$360

* Commodity Hetzner / DigitalOcean compute instance

Cumulative 3-Year ROI+$16,740Net savings across 36 months (98% reduction)
Annual Free Cash:+$5,580/yr
Need C-Level Buy-In? Generate an instant ROI proposal memo to present to your CTO or CFO.
HEAD-TO-HEAD BATTLES // SIDE-BY-SIDE AUDIT

Compare Prometheus Head-to-Head

Custom Comparison Engine →
★ PRIMARY REPLACEMENTFOSS vs SaaS
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Native OpenTelemetry APM, Traces & Logs vs Datadog Host & Custom Metric Bills

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Rust & Object Storage Observability (140x Cheaper) vs Datadog Cloud Invoices

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Core Capabilities & Features

✓Dimensional data model with metric name and key-value labels
✓PromQL: flexible query language for aggregation and math
✓Pull-based HTTP scrape model with service discovery

Self-Host Prometheus with Docker Compose

Tweak configuration ports, secrets, and volumes live. Download or copy your ready-to-run container file:

1-Click Docker Compose Generator

Generate production-ready container definitions with customizable ports and volumes.

PrometheusApache-2.0

The open-source systems monitoring and alerting toolkit designed for reliability

Difficulty: Medium66,517 ⭐
Configure Parameters
docker-compose.prometheus.yml
version: '3.8'

services:
  prometheus:
    image: prom/prometheus:latest
    container_name: prometheus
    restart: unless-stopped
    ports:
      - "${SERVER_PORT:-9090}:9090"
    volumes:
      - prometheus_data:/prometheus

volumes:
  prometheus_data:
$docker compose up -d

Frequently Asked Questions: Self-Hosting Prometheus

How do I self-host Prometheus using Docker Compose?

You can deploy Prometheus (prometheus/prometheus) on any Linux server by copying the docker-compose.yml template on this page, configuring your desired host port and persistent volume directory, and running 'docker compose up -d'.

How does Prometheus compare to Datadog?

Prometheus is an open-source, self-hosted alternative to Datadog built with Go. Unlike Datadog ($15 - $23 / host / month + surprise bills), Prometheus has zero per-user licensing fees and keeps 100% of your data on your own infrastructure.

What are the minimum VPS RAM and CPU requirements for Prometheus?

For production self-hosting (Medium difficulty tier), we recommend at least 4 GB RAM (minimum 2 GB), 2 vCPU, and 25 GB SSD storage, which typically costs $10 - $15/mo (e.g. Hetzner CPX21 or Linode).

Is Prometheus free for commercial business use under the Apache-2.0 license?

Yes. Distributed under the Apache-2.0 license, Prometheus can be self-hosted internally by businesses and engineering teams of any size without per-seat royalties.

README INTEGRATION // REPO EMBED

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