Envoy monitoring

Envoy gateway

Metrics:
$ wget -O - http://10.42.2.86:19001/metrics| grep -Ev '^(#|go_|process_)'| sed 's/[{ ].*//' |sort|uniq
certwatcher_read_certificate_errors_total
certwatcher_read_certificate_total
controller_runtime_active_workers
controller_runtime_conversion_webhook_panics_total
controller_runtime_max_concurrent_reconciles
controller_runtime_reconcile_errors_total
controller_runtime_reconcile_panics_total
controller_runtime_reconcile_time_seconds_bucket
controller_runtime_reconcile_time_seconds_count
controller_runtime_reconcile_time_seconds_sum
controller_runtime_reconcile_total
controller_runtime_terminal_reconcile_errors_total
controller_runtime_webhook_panics_total
controller_runtime_webhook_requests_in_flight
controller_runtime_webhook_requests_total
leader_election_master_status
resource_apply_duration_seconds_bucket
resource_apply_duration_seconds_count
resource_apply_duration_seconds_sum
resource_apply_total
resource_delete_duration_seconds_bucket
resource_delete_duration_seconds_count
resource_delete_duration_seconds_sum
resource_delete_total
rest_client_rate_limiter_duration_seconds_bucket
rest_client_rate_limiter_duration_seconds_count
rest_client_rate_limiter_duration_seconds_sum
rest_client_request_duration_seconds_bucket
rest_client_request_duration_seconds_count
rest_client_request_duration_seconds_sum
rest_client_request_size_bytes_bucket
rest_client_request_size_bytes_count
rest_client_request_size_bytes_sum
rest_client_requests_total
rest_client_response_size_bytes_bucket
rest_client_response_size_bytes_count
rest_client_response_size_bytes_sum
status_update_duration_seconds_bucket
status_update_duration_seconds_count
status_update_duration_seconds_sum
status_update_total
wasm_cache_entries
watchable_depth
watchable_publish_total
watchable_subscribe_duration_seconds_bucket
watchable_subscribe_duration_seconds_count
watchable_subscribe_duration_seconds_sum
watchable_subscribe_total
workqueue_adds_total
workqueue_depth
workqueue_longest_running_processor_seconds
workqueue_queue_duration_seconds_bucket
workqueue_queue_duration_seconds_count
workqueue_queue_duration_seconds_sum
workqueue_retries_total
workqueue_unfinished_work_seconds
workqueue_work_duration_seconds_bucket
workqueue_work_duration_seconds_count
workqueue_work_duration_seconds_sum
xds_snapshot_create_total
xds_snapshot_update_total