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Every cluster has a statistics tree rooted at cluster.
| Name | Type | Description |
|---|---|---|
| upstream_cx_total | Counter | Total connections |
| upstream_cx_active | Gauge | Total active connections |
| upstream_cx_http1_total | Counter | Total HTTP/1.1 connections |
| upstream_cx_http2_total | Counter | Total HTTP/2 connections |
| upstream_cx_connect_fail | Counter | Total connection failures |
| upstream_cx_connect_timeout | Counter | Total connection connect timeouts |
| upstream_cx_idle_timeout | Counter | Total connection idle timeouts |
| upstream_cx_connect_attempts_exceeded | Counter | Total consecutive connection failures exceeding configured connection attempts |
| upstream_cx_overflow | Counter | Total times that the cluster’s connection circuit breaker overflowed |
| upstream_cx_connect_ms | Histogram | Connection establishment milliseconds |
| upstream_cx_length_ms | Histogram | Connection length milliseconds |
| upstream_cx_destroy | Counter | Total destroyed connections |
| upstream_cx_destroy_local | Counter | Total connections destroyed locally |
| upstream_cx_destroy_remote | Counter | Total connections destroyed remotely |
| upstream_cx_destroy_with_active_rq | Counter | Total connections destroyed with 1+ active request |
| upstream_cx_destroy_local_with_active_rq | Counter | Total connections destroyed locally with 1+ active request |
| upstream_cx_destroy_remote_with_active_rq | Counter | Total connections destroyed remotely with 1+ active request |
| upstream_cx_close_notify | Counter | Total connections closed via HTTP/1.1 connection close header or HTTP/2 GOAWAY |
| upstream_cx_rx_bytes_total | Counter | Total received connection bytes |
| upstream_cx_rx_bytes_buffered | Gauge | Received connection bytes currently buffered |
| upstream_cx_tx_bytes_total | Counter | Total sent connection bytes |
| upstream_cx_tx_bytes_buffered | Gauge | Send connection bytes currently buffered |
| upstream_cx_protocol_error | Counter | Total connection protocol errors |
| upstream_cx_max_requests | Counter | Total connections closed due to maximum requests |
| upstream_cx_none_healthy | Counter | Total times connection not established due to no healthy hosts |
| upstream_rq_total | Counter | Total requests |
| upstream_rq_active | Gauge | Total active requests |
| upstream_rq_pending_total | Counter | Total requests pending a connection pool connection |
| upstream_rq_pending_overflow | Counter | Total requests that overflowed connection pool circuit breaking and were failed |
| upstream_rq_pending_failure_eject | Counter | Total requests that were failed due to a connection pool connection failure |
| upstream_rq_pending_active | Gauge | Total active requests pending a connection pool connection |
| upstream_rq_cancelled | Counter | Total requests cancelled before obtaining a connection pool connection |
| upstream_rq_maintenance_mode | Counter | Total requests that resulted in an immediate 503 due to |
| upstream_rq_timeout | Counter | Total requests that timed out waiting for a response |
| upstream_rq_per_try_timeout | Counter | Total requests that hit the per try timeout |
| upstream_rq_rx_reset | Counter | Total requests that were reset remotely |
| upstream_rq_tx_reset | Counter | Total requests that were reset locally |
| upstream_rq_retry | Counter | Total request retries |
| upstream_rq_retry_success | Counter | Total request retry successes |
| upstream_rq_retry_overflow | Counter | Total requests not retried due to circuit breaking |
| upstream_flow_control_paused_reading_total | Counter | Total number of times flow control paused reading from upstream |
| upstream_flow_control_resumed_reading_total | Counter | Total number of times flow control resumed reading from upstream |
| upstream_flow_control_backed_up_total | Counter | Total number of times the upstream connection backed up and paused reads from downstream |
| upstream_flow_control_drained_total | Counter | Total number of times the upstream connection drained and resumed reads from downstream |
| membership_change | Counter | Total cluster membership changes |
| membership_healthy | Gauge | Current cluster healthy total (inclusive of both health checking and outlier detection) |
| membership_total | Gauge | Current cluster membership total |
| retry_or_shadow_abandoned | Counter | Total number of times shadowing or retry buffering was canceled due to buffer limits |
| config_reload | Counter | Total API fetches that resulted in a config reload due to a different config |
| update_attempt | Counter | Total cluster membership update attempts |
| update_success | Counter | Total cluster membership update successes |
| update_failure | Counter | Total cluster membership update failures |
| update_empty | Counter | Total cluster membership updates ending with empty cluster load assignment and continuing with previous config |
| update_no_rebuild | Counter | Total successful cluster membership updates that didn’t result in any cluster load balancing structure rebuilds |
| version | Gauge | Hash of the contents from the last successful API fetch |
| max_host_weight | Gauge | Maximum weight of any host in the cluster |
| bind_errors | Counter | Total errors binding the socket to the configured source address |
Health check statistics
If health check is configured, the cluster has an additional statistics tree rooted at cluster.
| Name | Type | Description |
|---|---|---|
| attempt | Counter | Number of health checks |
| success | Counter | Number of successful health checks |
| failure | Counter | Number of immediately failed health checks (e.g. HTTP 503) as well as network failures |
| passive_failure | Counter | Number of health check failures due to passive events (e.g. x-envoy-immediate-health-check-fail) |
| network_failure | Counter | Number of health check failures due to network error |
| verify_cluster | Counter | Number of health checks that attempted cluster name verification |
| healthy | Gauge | Number of healthy members |
Outlier detection statistics
Circuit breakers statistics will be rooted at cluster.
| Name | Type | Description |
|---|---|---|
| cx_open | Gauge | Whether the connection circuit breaker is closed (0) or open (1) |
| rq_pending_open | Gauge | Whether the pending requests circuit breaker is closed (0) or open (1) |
| rq_open | Gauge | Whether the requests circuit breaker is closed (0) or open (1) |
| rq_retry_open | Gauge | Whether the retry circuit breaker is closed (0) or open (1) |
Dynamic HTTP statistics
If HTTP is used, dynamic HTTP response code statistics are also available. These are emitted by various internal systems as well as some filters such as the and rate limit filter. They are rooted at cluster.
| Name | Type | Description |
|---|---|---|
| upstreamrq_completed | Counter | Total upstream requests completed |
| upstream_rq<xx> | Counter | Aggregate HTTP response codes (e.g., 2xx, 3xx, etc.) |
| upstreamrq<> | Counter | Specific HTTP response codes (e.g., 201, 302, etc.) |
| upstreamrq_time | Histogram | Request time milliseconds |
| canary.upstream_rq_completed | Counter | Total upstream canary requests completed |
| canary.upstream_rq<xx> | Counter | Upstream canary aggregate HTTP response codes |
| canary.upstreamrq<> | Counter | Upstream canary specific HTTP response codes |
| canary.upstreamrq_time | Histogram | Upstream canary request time milliseconds |
| internal.upstream_rq_completed | Counter | Total internal origin requests completed |
| internal.upstream_rq<xx> | Counter | Internal origin aggregate HTTP response codes |
| internal.upstreamrq<> | Counter | Internal origin specific HTTP response codes |
| internal.upstreamrq_time | Histogram | Internal origin request time milliseconds |
| external.upstream_rq_completed | Counter | Total external origin requests completed |
| external.upstream_rq<xx> | Counter | External origin aggregate HTTP response codes |
| external.upstreamrq<> | Counter | External origin specific HTTP response codes |
| external.upstream_rq_time | Histogram | External origin request time milliseconds |
Alternate tree dynamic HTTP statistics
If the service zone is available for the local service (via ) and the , Envoy will track the following statistics in cluster.
Load balancer statistics
Statistics for monitoring load balancer decisions. Stats are rooted at cluster.
| Name | Type | Description |
|---|---|---|
| lb_recalculate_zone_structures | Counter | The number of times locality aware routing structures are regenerated for fast decisions on upstream locality selection |
| lb_healthy_panic | Counter | Total requests load balanced with the load balancer in panic mode |
| lb_zone_cluster_too_small | Counter | No zone aware routing because of small upstream cluster size |
| lb_zone_routing_all_directly | Counter | Sending all requests directly to the same zone |
| lb_zone_routing_sampled | Counter | Sending some requests to the same zone |
| lb_zone_routing_cross_zone | Counter | Zone aware routing mode but have to send cross zone |
| lb_local_cluster_not_ok | Counter | Local host set is not set or it is panic mode for local cluster |
| lb_zone_number_differs | Counter | Number of zones in local and upstream cluster different |
| lb_zone_no_capacity_left | Counter | Total number of times ended with random zone selection due to rounding error |
| original_dst_host_invalid | Counter | Total number of invalid hosts passed to original destination load balancer |
Load balancer subset statistics
| Name | Type | Description |
|---|---|---|
| lb_subsets_active | Gauge | Number of currently available subsets |
| lb_subsets_created | Counter | Number of subsets created |
| lb_subsets_removed | Counter | Number of subsets removed due to no hosts |
| lb_subsets_selected | Counter | Number of times any subset was selected for load balancing |
| lb_subsets_fallback | Counter | Number of times the fallback policy was invoked |
