Prometheus APIs and Metrics

[akshaywa...@gmail.com]

Hi All,

How do we retrieve alerts, rules and metrics via API, the way we get that on the Prometheus expression browser? What are the APIs available for Prometheus (looking for a list of available APIs)? Is it possible to get all the information that we get on the Prometheus dashboard via Prometheus APIs?

For Example:

I am able to get the targets via API($curl http:localhost:9090/api/v1/targets) and config ($curl http:localhost:9090/api/v1/status/config) but how do I get the alerts, flags, rules and any other information that we see on Prometheus Dashboard via APIs? I ran the below API calls but I am getting method not allowed error:

$ curl http://localhost:9090/api/v1/alerts

Method Not Allowed

$ curl http://localhost:9090/api/v1/status

Method Not Allowed

$ curl http://localhost:9090/api/v1/status/metrics

Method Not Allowed

$ curl http://localhost:9090/api/v1/status/flags

Method Not Allowed

$ curl http://localhost:9090/api/v1/status/rules

Method Not Allowed

$ curl http://localhost:9090/api/v1/rules

Method Not Allowed

$ curl "http://localhost:9090/api/v1/service-discovery"
Method Not Allowed

$ curl "http://localhost:9090/api/v1//status/service-discovery"
<a href="/api/v1/status/service-discovery">Moved Permanently</a>.

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Also for getting the metrics, do we need to grab the scrap url for ex. scrap url for node-exporter when we run /api/v1/targets and then run then run that scrap url to get the scraped metrics?

For Ex:

When I run targets api, it gives me localhost target:

$ curl "http://localhost:9090/api/v1/targets"
{"status":"success","data":{"activeTargets":[{"discoveredLabels":{"__address__":"localhost:9090","__metrics_path__":"/metrics","__scheme__":"http","job":"prometheus"},"labels":{"instance":"localhost:9090","job":"prometheus"},"scrapeUrl":"http://localhost:9090/metrics","lastError":"","lastScrape":"2018-09-06T12:22:20.365793767-05:00","health":"up"}],"droppedTargets":[]}}  

And then I run the below api to get the scraped metrics:

$ curl http://localhost:9090/metrics

Is this the correct way to retrieve the metrics Information?

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