Grafana
grafana.comMonitoring
Open-source dashboards that turn Prometheus, Loki, and a dozen other metrics sources into one place worth actually looking at.
Other products from Monitoring
Dead simple uptime checks with a genuinely usable free tier — most indie hackers' first monitoring tool and often their last.
Uptime monitoring, status pages, and on-call alerting bundled together well enough to replace three separate subscriptions.
The old-guard uptime checker now under SolarWinds — solid global probe network, but pricier than newer challengers.
A no-nonsense uptime and SSL/domain-expiry monitor that undercuts Pingdom on price without cutting real corners.