Optional label and field selectors to limit the discovery process to a subset of available resources. See https://kubernetes.io/docs/concepts/overview/working-with-objects/field-selectors/ and https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/ to learn more about the possible filters that can be used. Endpoints role supports pod, service and endpoints selectors, other roles only support selectors matching the role itself (e.g. node role can only contain node selectors).
Note: When making decision about using field/label selector make sure that this is the best approach - it will prevent Prometheus from reusing single list/watch for all scrape configs. This might result in a bigger load on the Kubernetes API, because per each selector combination there will be additional LIST/WATCH. On the other hand, if you just want to monitor small subset of pods in large cluster it's recommended to use selectors. Decision, if selectors should be used or not depends on the particular situation.
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