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Prometheus + Blackbox
CNCF metrics + alerting standard — Blackbox exporter does HTTP/TCP/ICMP probes.
What it does well
- Extremely flexible data model and powerful PromQL query language for deep analysis.
- Vast ecosystem of official and community-built exporters for countless integrations.
- No vendor lock-in; it is a free, open-source industry standard for metrics.
Where it falls short
- Self-hosted only, requiring significant engineering effort for setup, scaling, and maintenance.
- Long-term storage and high availability are not core features and require complex external solutions.
- Blackbox synthetic checks are basic; no multi-step transactions or browser-based scripting.
Alternatives to Prometheus + Blackbox
Monit
freeClassic Unix process + service monitor — runs locally, restarts services if they die.
Zabbix
freeEnterprise-grade open-source monitoring — free forever, paid support available.
Time-series storage for metrics — old-school but reliable, paired with Grafana for dashboards.
Icinga
freeModern Nagios fork — open source, plugin-compatible with Nagios checks.