May 2019
Intermediate to advanced
442 pages
11h 36m
English
Content preview from Hands-On Infrastructure Monitoring with Prometheus
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Exporter fundamentals
When the exporter starts, it binds to a configured port and exposes the internal state of whatever is being collected in an HTTP endpoint of your choosing (the default being /metrics). The instrumentation data is collected when an HTTP GET request is made to the configured endpoint. For example, node exporter, one of the most commonly used exporters, relies on a number of kernel statistics to present data such as disk I/O, CPU, memory, network, filesystem usage, and much, much more. Every single time that endpoint is scraped, the information is quickly gathered and exposed in a synchronous operation.
The HTTP GET request that's made by the Prometheus server to the observed system for metric collection is called a scrape ...
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