Within the Prometheus UI if you navigate to Status -> Targets you can see 
what targets Prometheus is scraping (or attempting to scrape) and when each 
was last successfully scraped.

You can query Prometheus via it's HTTP API: 
https://prometheus.io/docs/prometheus/latest/querying/api/

On Thursday, February 27, 2020 at 10:40:38 AM UTC-8, adi garg wrote:
>
> Thanks a lot, Brian, that clears a lot of things for me. Just one more 
> doubt is there a way to look at the current scraped metrics as I am not 
> sure but I think that Prometheus stores metrics in 2 hours chunk in the 
> memory(Ram) and after then sends them to the storage(SSD). Like how can I 
> confirm this that my Prometheus is scraping all those targets? 
> Moreover, that querying part can either be done by promql locally or using 
> grafana right?
>
> On Thursday, February 27, 2020 at 11:55:58 PM UTC+5:30, Brian Candler 
> wrote:
>>
>> On Thursday, 27 February 2020 17:53:41 UTC, adi garg wrote:
>>>
>>> I was able to select my hs2 metrics there for querying, but I couldn't 
>>> see them on localhost:9090/metrics. Is there any reason for it. 
>>>
>>
>> Yes.
>>
>> /metrics on the prometheus server only exposes metrics about the 
>> operation of the prometheus server itself.
>>
>> If you want to query metrics which are *stored* in the prometheus time 
>> series database, then you need to use the prometheus API:
>>
>> https://prometheus.io/docs/prometheus/latest/querying/api/#expression-queries
>>
>> There's a command line interface that wraps this for you: e.g.
>> promtool query instant http://localhost:9090 up
>> is like entering "up" as a query in the GUI
>>  
>>
>>> Also, my metrics on port 12156 are present on the '/' route and not on 
>>> '/metrics', so that can be handled with metrics_path right?
>>>
>>>
>> Yes.  If you can scrape the metrics using
>> curl http://x.x.x.x:12156/
>> then prometheus needs metrics_path of "/"
>>
>>

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