Show how to use Prometheus and/or Grafana in "accessing-metrics" docs

https://knative.dev/docs/serving/accessing-metrics/#grafana https://knative.dev/docs/serving/accessing-metrics/#prometheus

These two pages say "here's how you access {Grafana,Prometheus}".

As a user who's not familiar with any of these, I would've appreciated which {dashboard,metrics} I am supposed to look at to learn more about my application running on Knative.

For Grafana: Which dashboards are useful to me, what do I look at.

For Prometheus: How do I use this to monitor my apps, which metrics are belonging to my apps.

I am gonna paste below the list of metrics http://localhost:9090 Prometheus homepage shows (which is where the docs send the users). Assume you're a Knative uesr trying to choose among these metrics.

There are about 1300 of them, the word knative or revision is not mentioned even once. Clearly the monitoring is not helping here by not being verbose enough, let's help users understand which one of them they are gonna choose in the docs.

APIServiceOpenAPIAggregationControllerQueue1_adds APIServiceOpenAPIAggregationControllerQueue1_depth APIServiceOpenAPIAggregationControllerQueue1_longest_running_processor_microseconds APIServiceOpenAPIAggregationControllerQueue1_queue_latency APIServiceOpenAPIAggregationControllerQueue1_queue_latency_count APIServiceOpenAPIAggregationControllerQueue1_queue_latency_sum APIServiceOpenAPIAggregationControllerQueue1_retries APIServiceOpenAPIAggregationControllerQueue1_unfinished_work_seconds APIServiceOpenAPIAggregationControllerQueue1_work_duration APIServiceOpenAPIAggregationControllerQueue1_work_duration_count APIServiceOpenAPIAggregationControllerQueue1_work_duration_sum APIServiceRegistrationController_adds APIServiceRegistrationController_depth APIServiceRegistrationController_longest_running_processor_microseconds APIServiceRegistrationController_queue_latency APIServiceRegistrationController_queue_latency_count APIServiceRegistrationController_queue_latency_sum APIServiceRegistrationController_retries APIServiceRegistrationController_unfinished_work_seconds APIServiceRegistrationController_work_duration APIServiceRegistrationController_work_duration_count APIServiceRegistrationController_work_duration_sum AvailableConditionController_adds AvailableConditionController_depth AvailableConditionController_longest_running_processor_microseconds AvailableConditionController_queue_latency AvailableConditionController_queue_latency_count AvailableConditionController_queue_latency_sum AvailableConditionController_retries AvailableConditionController_unfinished_work_seconds AvailableConditionController_work_duration AvailableConditionController_work_duration_count AvailableConditionController_work_duration_sum DiscoveryController_adds DiscoveryController_depth DiscoveryController_longest_running_processor_microseconds DiscoveryController_queue_latency DiscoveryController_queue_latency_count DiscoveryController_queue_latency_sum DiscoveryController_retries DiscoveryController_unfinished_work_seconds DiscoveryController_work_duration DiscoveryController_work_duration_count DiscoveryController_work_duration_sum activator_client_latency_bucket activator_client_latency_count activator_client_latency_sum activator_client_results activator_go_alloc activator_go_bucket_hash_sys activator_go_frees activator_go_gc_cpu_fraction activator_go_gc_sys activator_go_heap_alloc activator_go_heap_idle activator_go_heap_in_use activator_go_heap_objects activator_go_heap_released activator_go_heap_sys activator_go_last_gc activator_go_lookups activator_go_mallocs activator_go_mcache_in_use activator_go_mcache_sys activator_go_mspan_in_use activator_go_mspan_sys activator_go_next_gc activator_go_num_forced_gc activator_go_num_gc activator_go_other_sys activator_go_stack_in_use activator_go_stack_sys activator_go_sys activator_go_total_alloc activator_go_total_gc_pause_ns activator_request_concurrency activator_request_count activator_request_latencies_bucket activator_request_latencies_count activator_request_latencies_sum admission_quota_controller_adds admission_quota_controller_depth admission_quota_controller_longest_running_processor_microseconds admission_quota_controller_queue_latency admission_quota_controller_queue_latency_count admission_quota_controller_queue_latency_sum admission_quota_controller_unfinished_work_seconds admission_quota_controller_work_duration admission_quota_controller_work_duration_count admission_quota_controller_work_duration_sum aggregator_unavailable_apiservice aggregator_unavailable_apiservice_count apiserver_admission_controller_admission_duration_seconds_bucket apiserver_admission_controller_admission_duration_seconds_count apiserver_admission_controller_admission_duration_seconds_sum apiserver_admission_step_admission_duration_seconds_bucket apiserver_admission_step_admission_duration_seconds_count apiserver_admission_step_admission_duration_seconds_sum apiserver_admission_step_admission_duration_seconds_summary apiserver_admission_step_admission_duration_seconds_summary_count apiserver_admission_step_admission_duration_seconds_summary_sum apiserver_admission_webhook_admission_duration_seconds_bucket apiserver_admission_webhook_admission_duration_seconds_count apiserver_admission_webhook_admission_duration_seconds_sum apiserver_audit_event_total apiserver_audit_level_total apiserver_audit_requests_rejected_total apiserver_client_certificate_expiration_seconds_bucket apiserver_client_certificate_expiration_seconds_count apiserver_client_certificate_expiration_seconds_sum apiserver_current_inflight_requests apiserver_init_events_total apiserver_longrunning_gauge apiserver_registered_watchers apiserver_request_count apiserver_request_duration_seconds_bucket apiserver_request_duration_seconds_count apiserver_request_duration_seconds_sum apiserver_request_latencies_bucket apiserver_request_latencies_count apiserver_request_latencies_sum 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controller_workqueue_depth controller_workqueue_longest_running_processor_seconds_bucket controller_workqueue_longest_running_processor_seconds_count controller_workqueue_longest_running_processor_seconds_sum controller_workqueue_queue_latency_seconds_bucket controller_workqueue_queue_latency_seconds_count controller_workqueue_queue_latency_seconds_sum controller_workqueue_retries_total controller_workqueue_unfinished_work_seconds_bucket controller_workqueue_unfinished_work_seconds_count controller_workqueue_unfinished_work_seconds_sum controller_workqueue_work_duration_seconds_bucket controller_workqueue_work_duration_seconds_count controller_workqueue_work_duration_seconds_sum crdEstablishing_adds crdEstablishing_depth crdEstablishing_longest_running_processor_microseconds crdEstablishing_queue_latency crdEstablishing_queue_latency_count crdEstablishing_queue_latency_sum crdEstablishing_retries crdEstablishing_unfinished_work_seconds crdEstablishing_work_duration 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knative / docs

Show how to use Prometheus and/or Grafana in "accessing-metrics" docs #2070