k8s_pod_phase=\"Pending\", k8s_pod_ready=\"false\"

^ that's alarming to me at first glance. Are all your pods coming up and resolving into a healthy state?

Yeah, all pods are in healthy state.

correct, this could happen when otel-collector pod state is not healthy and metrics scraper attempts at that time. Do compare the timestamp. It should be okay to see few instances of these warning. Unless you see repeated warning, you are good.