caching-prom-exporter

caching-prom-exporter

Proof of concept prometheus exporter strongly modelled on https://github.com/prometheus/mysqld_exporter/tree/main.

This is a boilerplate for a prom exporter that has a built in cache for metric data. This could be useful when the metric source is pulled from somewhere on a long poll. This means that the prom metrics thread won't block and hit a timeout.

Caching works on a TTL basis, with items loaded asynchrousnly as they expire.

The prom collector implementation pulls the data from the cache that is responsible for refreshing if it is stale.

Adding a new metric

• add a new metric to var availableMetrics in exporter.go
• copy internal/metrics/ebs_volumes.go to a new file, change the struct name i.e MetricEbsVolumeCount and the cache key i.e ebsVolumeCount
• change the function for ExternalDataPull() to pull your data from a remote, slow source i.e AWS API Call