Project: Antrea (Runtime / Cloud Native Network)
File: prometheus-integration.md

Prometheus server can monitor various metrics and provide an observation of the Antrea Controller and Agent components. The doc provides general guidelines to the configuration of Prometheus server to operate with the Antrea components. is an open source monitoring and alerting server. Prometheus is capable of collecting metrics from various Kubernetes components, storing and providing alerts. Prometheus can provide visibility by integrating with other products such as . One of Prometheus capabilities is self-discovery of Kubernetes services which expose their metrics. So Prometheus can scrape the metrics of any additional components which are added to the cluster without further configuration changes. Enable Prometheus metrics listener by setting `enablePrometheusMetrics` parameter to true in the Controller and the Agent configurations. Prometheus integration with Antrea is validated as part of CI using Prometheus v2.46.0. Prometheus requires access to Kubernetes API resources for the service discovery capability. Reading metrics also requires access to the "/metrics" API endpoints. ```yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: prometheus rules: apiGroups: [""] resources: nodes nodes/proxy services endpoints pods verbs: ["get", "list", "watch"] apiGroups: networking.k8s.io resources: ingresses verbs: ["get", "list", "watch"] nonResourceURLs: ["/metrics"] verbs: ["get"] ``` To scrape the metrics from Antrea Controller and Agent, Prometheus needs the following permissions ```yaml kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1 metadata: name: prometheus-antrea rules: nonResourceURLs: /metrics verbs: get ``` Add the following jobs to Prometheus scraping configuration to enable metrics collection from Antrea components. Antrea Agent metrics endpoint is exposed through Antrea apiserver on `apiport` config parameter given in `antrea-agent.conf` (default value is 10350). Antrea Controller metrics endpoint is exposed through Antrea apiserver on `apiport` config parameter given in `antrea-controller.conf` (default value is 10349). ```yaml job_name: 'antrea-controllers' kubernetessdconfigs: role: endpoints scheme: https tls_config: ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt insecureskipverify: true bearertokenfile: /var/run/secrets/kubernetes.io/serviceaccount/token relabel_configs: sourcelabels: [metakubernetesnamespace, metakubernetespodcontainer_name] action: keep regex: kube-system;antrea-controller sourcelabels: [metakubernetespodnodename, metakubernetespodname] target_label: instance ``` ```yaml job_name: 'antrea-agents' kubernetessdconfigs: role: pod scheme: https tls_config: ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt insecureskipverify: true bearertokenfile: /var/run/secrets/kubernetes.io/serviceaccount/token relabel_configs: sourcelabels: [metakubernetesnamespace, metakubernetespodcontainer_name] action: keep regex: kube-system;antrea-agent sourcelabels: [metakubernetespodnodename, metakubernetespodname] target_label: instance ``` For further reference see the enclosed . The configuration file above can be used to deploy Prometheus Server with scraping configuration for Antrea services. To deploy this configuration use `kubectl apply -f build/yamls/antrea-prometheus.yml` Antrea Controller and Agents expose various metrics, some of which are provided by the Antrea components and others which are provided by 3rd party components used by the Antrea components. Below is a list of metrics, provided by the components and by 3rd parties. antrea_agent_conntrack_antrea_connection_count: Number of connections in the Antrea ZoneID of the conntrack table. This metric gets updated at an interval specified by flowPollInterval, a configuration parameter for the Agent. antrea_agent_conntrack_max_connection_count: Size of the conntrack table. This metric gets updated at an interval specified by flowPollInterval, a configuration parameter for the Agent. antrea_agent_conntrack_total_connection_count: Number of connections in the conntrack table. This metric gets updated at an interval specified by flowPollInterval, a configuration parameter for the Agent. antrea_agent_denied_connection_count: Number of denied connections detected by Flow Exporter deny connections tracking. This metric gets updated when a flow is rejected/dropped by network policy. antrea_agent_egress_networkpolicy_rule_count: Number of egress NetworkPolicy rules on local Node which are managed by the Antrea Agent. antrea_agent_flow_collector_reconnection_count: Number of re-connections between Flow Exporter and flow collector. This metric gets updated whenever the connection is re-established between the Flow Exporter and the flow collector (e.g. the Flow Aggregator). antrea_agent_ingress_networkpolicy_rule_count: Number of ingress NetworkPolicy rules on local Node which are managed by the Antrea

antrea_agent_local_pod_count: Number of Pods on local Node which are managed by the Antrea Agent. antrea_agent_networkpolicy_count: Number of NetworkPolicies on local Node which are managed by the Antrea Agent. antrea_agent_ovs_flow_count: Flow count for each OVS flow table. The TableID and TableName are used as labels. antrea_agent_ovs_flow_ops_count: Number of OVS flow operations, partitioned by operation type (add, modify and delete). antrea_agent_ovs_flow_ops_error_count: Number of OVS flow operation errors, partitioned by operation type (add, modify and delete). antrea_agent_ovs_flow_ops_latency_milliseconds: The latency of OVS flow operations, partitioned by operation type (add, modify and delete). antrea_agent_ovs_meter_packet_dropped_count: Number of packets dropped by OVS meter. The value is greater than 0 when the packets exceed the rate-limit. antrea_agent_ovs_total_flow_count: Total flow count of all OVS flow tables. antrea_controller_acnp_status_updates: The total number of actual status updates performed for Antrea ClusterNetworkPolicy Custom Resources antrea_controller_address_group_processed: The total number of address-group processed antrea_controller_address_group_sync_duration_milliseconds: The duration of syncing address-group antrea_controller_annp_status_updates: The total number of actual status updates performed for Antrea NetworkPolicy Custom Resources antrea_controller_applied_to_group_processed: The total number of applied-to-group processed antrea_controller_applied_to_group_sync_duration_milliseconds: The duration of syncing applied-to-group antrea_controller_length_address_group_queue: The length of AddressGroupQueue antrea_controller_length_applied_to_group_queue: The length of AppliedToGroupQueue antrea_controller_length_network_policy_queue: The length of InternalNetworkPolicyQueue antrea_controller_network_policy_processed: The total number of internal-networkpolicy processed antrea_controller_network_policy_sync_duration_milliseconds: The duration of syncing internal-networkpolicy antrea_proxy_sync_proxy_rules_duration_seconds: SyncProxyRules duration of AntreaProxy in seconds antrea_proxy_total_endpoints_installed: The number of Endpoints installed by AntreaProxy antrea_proxy_total_endpoints_updates: The cumulative number of Endpoint updates received by AntreaProxy antrea_proxy_total_services_installed: The number of Services installed by AntreaProxy antrea_proxy_total_services_updates: The cumulative number of Service updates received by AntreaProxy aggregator_discovery_aggregation_count_total: Counter of number of times discovery was aggregated apiserver_audit_event_total: Counter of audit events generated and sent to the audit backend. apiserver_audit_requests_rejected_total: Counter of apiserver requests rejected due to an error in audit logging backend. apiserver_client_certificate_expiration_seconds: Distribution of the remaining lifetime on the certificate used to authenticate a request. apiserver_current_inflight_requests: Maximal number of currently used inflight request limit of this apiserver per request kind in last second. apiserver_delegated_authn_request_duration_seconds: Request latency in seconds. Broken down by status code. apiserver_delegated_authn_request_total: Number of HTTP requests partitioned by status code. apiserver_delegated_authz_request_duration_seconds: Request latency in seconds. Broken down by status code. apiserver_delegated_authz_request_total: Number of HTTP requests partitioned by status code. apiserver_envelope_encryption_dek_cache_fill_percent: Percent of the cache slots currently occupied by cached DEKs. apiserver_flowcontrol_read_vs_write_current_requests: EXPERIMENTAL: Observations, at the end of every nanosecond, of the number of requests (as a fraction of the relevant limit) waiting or in regular stage of execution apiserver_flowcontrol_seat_fair_frac: Fair fraction of server's concurrency to allocate to each priority level that can use it apiserver_longrunning_requests: Gauge of all active long-running apiserver requests broken out by verb, group, version, resource, scope and component. Not all requests are tracked this way. apiserver_request_duration_seconds: Response latency distribution in seconds for each verb, dry run value, group, version, resource, subresource, scope and component. apiserver_request_filter_duration_seconds: Request filter latency distribution in seconds, for each filter type apiserver_request_sli_duration_seconds: Response latency distribution (not counting webhook duration and priority & fairness queue wait times) in seconds for each verb, group, version, resource, subresource, scope and component. apiserver_request_slo_duration_seconds: Response latency distribution (not counting webhook duration and priority & fairness queue wait times) in seconds for each verb, group, version, resource, subresource, scope and component. apiserver_request_total: Counter of apiserver requests broken out for each verb, dry run value, group, version, resource, scope, component, and HTTP response code. apiserver_response_sizes: Response size distribution in bytes for each group, version, verb, resource, subresource, scope and component. apiserver_storage_data_key_generation_duration_seconds: Latencies in seconds of data encryption key(DEK) generation operations. apiserver_storage_data_key_generation_failures_total: Total number of failed data encryption key(DEK) generation operations. apiserver_storage_envelope_transformation_cache_misses_total: Total number of cache misses while accessing key decryption

apiserver_tls_handshake_errors_total: Number of requests dropped with 'TLS handshake error from' error apiserver_watch_events_sizes: Watch event size distribution in bytes apiserver_watch_events_total: Number of events sent in watch clients apiserver_webhooks_x509_insecure_sha1_total: Counts the number of requests to servers with insecure SHA1 signatures in their serving certificate OR the number of connection failures due to the insecure SHA1 signatures (either/or, based on the runtime environment) apiserver_webhooks_x509_missing_san_total: Counts the number of requests to servers missing SAN extension in their serving certificate OR the number of connection failures due to the lack of x509 certificate SAN extension missing (either/or, based on the runtime environment) authenticated_user_requests: Counter of authenticated requests broken out by username. authentication_attempts: Counter of authenticated attempts. authentication_duration_seconds: Authentication duration in seconds broken out by result. authentication_token_cache_active_fetch_count: authentication_token_cache_fetch_total: authentication_token_cache_request_duration_seconds: authentication_token_cache_request_total: authorization_attempts_total: Counter of authorization attempts broken down by result. It can be either 'allowed', 'denied', 'no-opinion' or 'error'. authorization_duration_seconds: Authorization duration in seconds broken out by result. cardinality_enforcement_unexpected_categorizations_total: The count of unexpected categorizations during cardinality enforcement. disabled_metrics_total: The count of disabled metrics. field_validation_request_duration_seconds: Response latency distribution in seconds for each field validation value go_cgo_go_to_c_calls_calls_total: Count of calls made from Go to C by the current process. go_cpu_classes_gc_mark_assist_cpu_seconds_total: Estimated total CPU time goroutines spent performing GC tasks to assist the GC and prevent it from falling behind the application. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_gc_mark_dedicated_cpu_seconds_total: Estimated total CPU time spent performing GC tasks on processors (as defined by GOMAXPROCS) dedicated to those tasks. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_gc_mark_idle_cpu_seconds_total: Estimated total CPU time spent performing GC tasks on spare CPU resources that the Go scheduler could not otherwise find a use for. This should be subtracted from the total GC CPU time to obtain a measure of compulsory GC CPU time. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_gc_pause_cpu_seconds_total: Estimated total CPU time spent with the application paused by the GC. Even if only one thread is running during the pause, this is computed as GOMAXPROCS times the pause latency because nothing else can be executing. This is the exact sum of samples in /gc/pause:seconds if each sample is multiplied by GOMAXPROCS at the time it is taken. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_gc_total_cpu_seconds_total: Estimated total CPU time spent performing GC tasks. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. Sum of all metrics in /cpu/classes/gc. go_cpu_classes_idle_cpu_seconds_total: Estimated total available CPU time not spent executing any Go or Go runtime code. In other words, the part of /cpu/classes/total:cpu-seconds that was unused. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_scavenge_assist_cpu_seconds_total: Estimated total CPU time spent returning unused memory to the underlying platform in response eagerly in response to memory pressure. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_cpu_classes_scavenge_background_cpu_seconds_total: Estimated total CPU time spent performing background tasks to return unused memory to the underlying platform. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes

go_cpu_classes_scavenge_total_cpu_seconds_total: Estimated total CPU time spent performing tasks that return unused memory to the underlying platform. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. Sum of all metrics in /cpu/classes/scavenge. go_cpu_classes_total_cpu_seconds_total: Estimated total available CPU time for user Go code or the Go runtime, as defined by GOMAXPROCS. In other words, GOMAXPROCS integrated over the wall-clock duration this process has been executing for. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. Sum of all metrics in /cpu/classes. go_cpu_classes_user_cpu_seconds_total: Estimated total CPU time spent running user Go code. This may also include some small amount of time spent in the Go runtime. This metric is an overestimate, and not directly comparable to system CPU time measurements. Compare only with other /cpu/classes metrics. go_gc_cycles_automatic_gc_cycles_total: Count of completed GC cycles generated by the Go runtime. go_gc_cycles_forced_gc_cycles_total: Count of completed GC cycles forced by the application. go_gc_cycles_total_gc_cycles_total: Count of all completed GC cycles. go_gc_duration_seconds: A summary of the pause duration of garbage collection cycles. go_gc_gogc_percent: Heap size target percentage configured by the user, otherwise 100. This value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent function. go_gc_gomemlimit_bytes: Go runtime memory limit configured by the user, otherwise math.MaxInt64. This value is set by the GOMEMLIMIT environment variable, and the runtime/debug.SetMemoryLimit function. go_gc_heap_allocs_by_size_bytes: Distribution of heap allocations by approximate size. Bucket counts increase monotonically. Note that this does not include tiny objects as defined by /gc/heap/tiny/allocs:objects, only tiny blocks. go_gc_heap_allocs_bytes_total: Cumulative sum of memory allocated to the heap by the application. go_gc_heap_allocs_objects_total: Cumulative count of heap allocations triggered by the application. Note that this does not include tiny objects as defined by /gc/heap/tiny/allocs:objects, only tiny blocks. go_gc_heap_frees_by_size_bytes: Distribution of freed heap allocations by approximate size. Bucket counts increase monotonically. Note that this does not include tiny objects as defined by /gc/heap/tiny/allocs:objects, only tiny blocks. go_gc_heap_frees_bytes_total: Cumulative sum of heap memory freed by the garbage collector. go_gc_heap_frees_objects_total: Cumulative count of heap allocations whose storage was freed by the garbage collector. Note that this does not include tiny objects as defined by /gc/heap/tiny/allocs:objects, only tiny blocks. go_gc_heap_goal_bytes: Heap size target for the end of the GC cycle. go_gc_heap_live_bytes: Heap memory occupied by live objects that were marked by the previous GC. go_gc_heap_objects_objects: Number of objects, live or unswept, occupying heap memory. go_gc_heap_tiny_allocs_objects_total: Count of small allocations that are packed together into blocks. These allocations are counted separately from other allocations because each individual allocation is not tracked by the runtime, only their block. Each block is already accounted for in allocs-by-size and frees-by-size. go_gc_limiter_last_enabled_gc_cycle: GC cycle the last time the GC CPU limiter was enabled. This metric is useful for diagnosing the root cause of an out-of-memory error, because the limiter trades memory for CPU time when the GC's CPU time gets too high. This is most likely to occur with use of SetMemoryLimit. The first GC cycle is cycle 1, so a value of 0 indicates that it was never enabled. go_gc_pauses_seconds: Distribution of individual GC-related stop-the-world pause latencies. Bucket counts increase monotonically. go_gc_scan_globals_bytes: The total amount of global variable space that is scannable. go_gc_scan_heap_bytes: The total amount of heap space that is scannable. go_gc_scan_stack_bytes: The number of bytes of stack that were scanned last GC cycle. go_gc_scan_total_bytes: The total amount space that is scannable. Sum of all metrics in

go_gc_stack_starting_size_bytes: The stack size of new goroutines. go_godebug_non_default_behavior_execerrdot_events_total: The number of non-default behaviors executed by the os/exec package due to a non-default GODEBUG=execerrdot=... setting. go_godebug_non_default_behavior_gocachehash_events_total: The number of non-default behaviors executed by the cmd/go package due to a non-default GODEBUG=gocachehash=... setting. go_godebug_non_default_behavior_gocachetest_events_total: The number of non-default behaviors executed by the cmd/go package due to a non-default GODEBUG=gocachetest=... setting. go_godebug_non_default_behavior_gocacheverify_events_total: The number of non-default behaviors executed by the cmd/go package due to a non-default GODEBUG=gocacheverify=... setting. go_godebug_non_default_behavior_http2client_events_total: The number of non-default behaviors executed by the net/http package due to a non-default GODEBUG=http2client=... setting. go_godebug_non_default_behavior_http2server_events_total: The number of non-default behaviors executed by the net/http package due to a non-default GODEBUG=http2server=... setting. go_godebug_non_default_behavior_installgoroot_events_total: The number of non-default behaviors executed by the go/build package due to a non-default GODEBUG=installgoroot=... setting. go_godebug_non_default_behavior_jstmpllitinterp_events_total: The number of non-default behaviors executed by the html/template package due to a non-default GODEBUG=jstmpllitinterp=... setting. go_godebug_non_default_behavior_multipartmaxheaders_events_total: The number of non-default behaviors executed by the mime/multipart package due to a non-default GODEBUG=multipartmaxheaders=... setting. go_godebug_non_default_behavior_multipartmaxparts_events_total: The number of non-default behaviors executed by the mime/multipart package due to a non-default GODEBUG=multipartmaxparts=... setting. go_godebug_non_default_behavior_multipathtcp_events_total: The number of non-default behaviors executed by the net package due to a non-default GODEBUG=multipathtcp=... setting. go_godebug_non_default_behavior_panicnil_events_total: The number of non-default behaviors executed by the runtime package due to a non-default GODEBUG=panicnil=... setting. go_godebug_non_default_behavior_randautoseed_events_total: The number of non-default behaviors executed by the math/rand package due to a non-default GODEBUG=randautoseed=... setting. go_godebug_non_default_behavior_tarinsecurepath_events_total: The number of non-default behaviors executed by the archive/tar package due to a non-default GODEBUG=tarinsecurepath=... setting. go_godebug_non_default_behavior_tlsmaxrsasize_events_total: The number of non-default behaviors executed by the crypto/tls package due to a non-default GODEBUG=tlsmaxrsasize=... setting. go_godebug_non_default_behavior_x509sha1_events_total: The number of non-default behaviors executed by the crypto/x509 package due to a non-default GODEBUG=x509sha1=... setting. go_godebug_non_default_behavior_x509usefallbackroots_events_total: The number of non-default behaviors executed by the crypto/x509 package due to a non-default GODEBUG=x509usefallbackroots=... setting. go_godebug_non_default_behavior_zipinsecurepath_events_total: The number of non-default behaviors executed by the archive/zip package due to a non-default GODEBUG=zipinsecurepath=... setting. go_goroutines: Number of goroutines that currently exist. go_info: Information about the Go environment. go_memory_classes_heap_free_bytes: Memory that is completely free and eligible to be returned to the underlying system, but has not been. This metric is the runtime's estimate of free address space that is backed by physical memory. go_memory_classes_heap_objects_bytes: Memory occupied by live objects and dead objects that have not yet been marked free by the garbage collector. go_memory_classes_heap_released_bytes: Memory that is completely free and has been returned to the underlying system. This metric is the runtime's estimate of free address space that is still mapped into the process, but is not backed by physical memory. go_memory_classes_heap_stacks_bytes: Memory allocated from the heap that is reserved for stack space, whether or not it is currently in-use. Currently, this represents all stack memory for goroutines. It also includes all OS thread stacks in non-cgo programs. Note that stacks may be allocated differently in the future, and this may change. go_memory_classes_heap_unused_bytes: Memory that is reserved for heap objects but is not currently used to hold heap objects. go_memory_classes_metadata_mcache_free_bytes: Memory that is reserved for runtime mcache structures, but not in-use. go_memory_classes_metadata_mcache_inuse_bytes: Memory that is occupied by runtime mcache structures that are currently being used. go_memory_classes_metadata_mspan_free_bytes: Memory that is reserved for runtime mspan structures, but not in-use. go_memory_classes_metadata_mspan_inuse_bytes: Memory that is occupied by runtime mspan structures that are currently being used. go_memory_classes_metadata_other_bytes: Memory that is reserved for or used to hold runtime metadata. go_memory_classes_os_stacks_bytes: Stack memory allocated by the underlying operating system. In non-cgo programs this metric is currently zero. This may change in the

cgo programs this metric includes OS thread stacks allocated directly from the OS. Currently, this only accounts for one stack in c-shared and c-archive build modes, and other sources of stacks from the OS are not measured. This too may change in the future. go_memory_classes_other_bytes: Memory used by execution trace buffers, structures for debugging the runtime, finalizer and profiler specials, and more. go_memory_classes_profiling_buckets_bytes: Memory that is used by the stack trace hash map used for profiling. go_memory_classes_total_bytes: All memory mapped by the Go runtime into the current process as read-write. Note that this does not include memory mapped by code called via cgo or via the syscall package. Sum of all metrics in /memory/classes. go_memstats_alloc_bytes: Number of bytes allocated and still in use. go_memstats_alloc_bytes_total: Total number of bytes allocated, even if freed. go_memstats_buck_hash_sys_bytes: Number of bytes used by the profiling bucket hash table. go_memstats_frees_total: Total number of frees. go_memstats_gc_sys_bytes: Number of bytes used for garbage collection system metadata. go_memstats_heap_alloc_bytes: Number of heap bytes allocated and still in use. go_memstats_heap_idle_bytes: Number of heap bytes waiting to be used. go_memstats_heap_inuse_bytes: Number of heap bytes that are in use. go_memstats_heap_objects: Number of allocated objects. go_memstats_heap_released_bytes: Number of heap bytes released to OS. go_memstats_heap_sys_bytes: Number of heap bytes obtained from system. go_memstats_last_gc_time_seconds: Number of seconds since 1970 of last garbage collection. go_memstats_lookups_total: Total number of pointer lookups. go_memstats_mallocs_total: Total number of mallocs. go_memstats_mcache_inuse_bytes: Number of bytes in use by mcache structures. go_memstats_mcache_sys_bytes: Number of bytes used for mcache structures obtained from system. go_memstats_mspan_inuse_bytes: Number of bytes in use by mspan structures. go_memstats_mspan_sys_bytes: Number of bytes used for mspan structures obtained from system. go_memstats_next_gc_bytes: Number of heap bytes when next garbage collection will take place. go_memstats_other_sys_bytes: Number of bytes used for other system allocations. go_memstats_stack_inuse_bytes: Number of bytes in use by the stack allocator. go_memstats_stack_sys_bytes: Number of bytes obtained from system for stack allocator. go_memstats_sys_bytes: Number of bytes obtained from system. go_sched_gomaxprocs_threads: The current runtime.GOMAXPROCS setting, or the number of operating system threads that can execute user-level Go code simultaneously. go_sched_goroutines_goroutines: Count of live goroutines. go_sched_latencies_seconds: Distribution of the time goroutines have spent in the scheduler in a runnable state before actually running. Bucket counts increase monotonically. go_sync_mutex_wait_total_seconds_total: Approximate cumulative time goroutines have spent blocked on a sync.Mutex or sync.RWMutex. This metric is useful for identifying global changes in lock contention. Collect a mutex or block profile using the runtime/pprof package for more detailed contention data. go_threads: Number of OS threads created. hidden_metrics_total: The count of hidden metrics. process_cpu_seconds_total: Total user and system CPU time spent in seconds. process_max_fds: Maximum number of open file descriptors. process_open_fds: Number of open file descriptors. process_resident_memory_bytes: Resident memory size in bytes. process_start_time_seconds: Start time of the process since unix epoch in seconds. process_virtual_memory_bytes: Virtual memory size in bytes. process_virtual_memory_max_bytes: Maximum amount of virtual memory available in bytes. registered_metrics_total: The count of registered metrics broken by stability level and deprecation version. workqueue_adds_total: Total number of adds handled by workqueue workqueue_depth: Current depth of workqueue workqueue_longest_running_processor_seconds: How many seconds has the longest running processor for workqueue been running. workqueue_queue_duration_seconds: How long in seconds an item stays in workqueue before being requested. workqueue_retries_total: Total number of retries handled by workqueue workqueue_unfinished_work_seconds: How many seconds of work has done that is in progress and hasn't been observed by work_duration. Large values indicate stuck threads. One can deduce the number of stuck threads by observing the rate at which this increases. workqueue_work_duration_seconds: How long in seconds processing an item from workqueue takes.