collectd
The system statistics collection daemon
...Collected values can be stored, forwarded, logged, or exported to tools such as Graphite, Prometheus, Kafka, MQTT, RRDTool, and other monitoring destinations. collectd is built for efficient daemon-based operation, using caching, multithreading, and plugin-based processing to reduce system overhead. It is well suited for administrators and infrastructure teams that need flexible, lightweight, and extensible metrics collection.