I think this page can help you to write the sd config for kubernetes pods. https://github.com/nlighten/tomcat_exporter
For scraping only master pod of a given service it should have a special label so that Prometheus can discover it. An alternative approach would be a stateful set where every pod in a service can be given different labels. Did you try reading about kube dd config to scrape service endpoints? If that is possible then you will be scraping the master pod if you scrape the service endpoint. On Fri, Feb 28, 2020, 12:01 AM SS. OO. <[email protected]> wrote: > Hi! > > I have a Kubernetes/Prometeus newbie question. > > I have a Kubernetes application that I want to scale up via Horizontal Pod > Autoscaler based on custom metrics reflecting the length of the app's work > queue backlog in the app's internal database. > > I can expose the metrics on a pod port in Prometheus format, so there is > more than one scrape endpoint for fail-over purposes. However I do not want > Prometheus to call the scrape endpoint on every pod's instance, only one > instance at a time and failover to another instance only if necessary. All > instance endpoints report the same data, and calling them in parallel would > serve no useful purpose and only increase a workload on storage queries > behind the app runtime. > > Right now the application is packaged as a Kubernetes Deployment. Do I > need to convert it for the above as a Service, or can Prometeus understand > intrinsically or be instructed in the configuration that only one instance > is to be called at a time? > > Also, can someone please provide an example of the snippet I need to > insert into > > https://github.com/prometheus/prometheus/blob/master/documentation/examples/prometheus-kubernetes.yml > so Prometheus picks up the endpoint? Assuming, for example, it is exposed > on pod port 3333, path /metrics, service/pod named ABC or with label > appname=LABC? > Or do I simply tag the pod/service/deployment with some tag and Prometeus > starts to collect on it? If yes, how do I pack the endpoint > port+protocol+path into the tag? > > Thanks for the advice. > > -- > You received this message because you are subscribed to the Google Groups > "Prometheus Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/prometheus-users/cabf6ba3-79c8-4f5e-865d-1fc51ba52c72%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/cabf6ba3-79c8-4f5e-865d-1fc51ba52c72%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/CAKimyZsGX9GLMQLhB7evuXOo2FGS_c%2BdCcVo2S6HiZMNRbCf%2Bg%40mail.gmail.com.
