-   所以是 PrometheusMonitoring system and time series database ★ 60.9K Monitoring Time series License: Apache-2.0Prometheus, a Cloud Native Computing Foundation project, is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed. 
-   所以是 GrafanaOpen and composable observability and data visualization platform ★ 70.5K Monitoring Observability License: AGPL-3.0Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.  
-   所以是 SigNozOpenTelemetry observability platform with logs, traces and metrics ★ 24K Monitoring Observability License: MIT ExpatAll your logs, metrics, and traces in one place. Monitor your application, spot issues before they occur and troubleshoot downtime quickly with rich context. SigNoz is a cost-effective open-source alternative to Datadog and New Relic.