[Enhancement][opensearch] Make servicemonitor selector.matchLabels customizable (duplicate metrics through two services) #692
Description
Is your feature request related to a problem? Please describe.
Activating the servicemonitor leads to Prometheus scraping both services, the "normal" service, as well as the headless service leading to duplicates of each metric series (with labels service=opensearch and service=opensearch-headless). With service.labelsHeadless: [prometheus.io/scrape: "true"] I want the servicemonitor to only scrape the headless service. But the Helm chart does not allow me to adjust/expand the servicemonitor configuration spec.endpoints[].selector.matchLabels
Describe the solution you'd like
Allow overwriting the servicemonitor field spec.endpoints[].selector.matchLabels.
Describe alternatives you've considered
Maybe there is a more straight-forward solution or a trick avoid duplicate series. Setting labels to make both services distinguishable was the only approach that came to mind.