Prometheus Concepts: Difference between revisions
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Prometheus will pull metrics, by scraping the [[#Target|targets]]. The retrieval is done by invoking HTTP into endpoints, which are defined in the configuration. | Prometheus will pull metrics, by scraping the [[#Target|targets]]. The retrieval is done by invoking HTTP into endpoints, which are defined in the configuration. | ||
=Sources of Metrics= | =Sources of Metrics= | ||
==Instrumented Applications== | |||
Prometheus pulls metrics from instrumented applications. An instrumented application exposes Prometheus metrics on a given URL. Such an application will be identified by Prometheus as a [[#Target|target]] and scrapped at regular periods. | Prometheus pulls metrics from instrumented applications. An instrumented application exposes Prometheus metrics on a given URL. Such an application will be identified by Prometheus as a [[#Target|target]] and scrapped at regular periods. | ||
==Exporters== | |||
An alternative are prebuilt exporters. Examples: node exporter, SQL exporter, HAProxy exporter. | An alternative are prebuilt exporters. Examples: node exporter, SQL exporter, HAProxy exporter. | ||
Revision as of 17:59, 14 October 2020
Internal
Overview
Prometheus is a time series database plus tools to collect metrics to be stored in the database. Prometheus is a solution for system monitoring.
Target
Prometheus will monitor targets. A target can be a server, database, virtual machine, etc.
Pull vs. Push
Prometheus will pull metrics, by scraping the targets. The retrieval is done by invoking HTTP into endpoints, which are defined in the configuration.
Sources of Metrics
Instrumented Applications
Prometheus pulls metrics from instrumented applications. An instrumented application exposes Prometheus metrics on a given URL. Such an application will be identified by Prometheus as a target and scrapped at regular periods.
Exporters
An alternative are prebuilt exporters. Examples: node exporter, SQL exporter, HAProxy exporter.