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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
Sometimes it is better to have the ability to send metrics from the app to the monitoring system. This is called push model. There are monitoring systems, which support both pull and push models. For example, VictoriaMetrics.
Try Prometheus. This a modern popular monitoring system. It collects metrics from hosts and apps running on these hosts. The metrics are exposed at some http page (usually /metrics) either by the apps (modern apps usually expose Prometheus-compatible metrics) or by special exporters, which are available for almost every app out there.
Prometheus metrics can be visualized via Grafana.