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Every cluster has a statistics tree rooted at cluster.. with the following statistics:
| 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..health_check. with the following statistics:
| Name | Type | Description |
|---|---|---|
| ejections_enforced_total | Counter | Number of enforced ejections due to any outlier type |
| ejections_active | Gauge | Number of currently ejected hosts |
| ejections_overflow | Counter | Number of ejections aborted due to the max ejection % |
| ejections_enforced_consecutive_5xx | Counter | Number of enforced consecutive 5xx ejections |
| ejections_detected_consecutive_5xx | Counter | Number of detected consecutive 5xx ejections (even if unenforced) |
| ejections_enforced_success_rate | Counter | Number of enforced success rate outlier ejections |
| ejections_detected_success_rate | Counter | Number of detected success rate outlier ejections (even if unenforced) |
| ejections_enforced_consecutive_gateway_failure | Counter | Number of enforced consecutive gateway failure ejections |
| ejections_detected_consecutive_gateway_failure | Counter | Number of detected consecutive gateway failure ejections (even if unenforced) |
| ejections_total | Counter | Deprecated. Number of ejections due to any outlier type (even if unenforced) |
| ejections_consecutive_5xx | Counter | Deprecated. Number of consecutive 5xx ejections (even if unenforced) |
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 router filter and . They are rooted at cluster.. and contain the following statistics:
If alternate tree statistics are configured, they will be present in the cluster... namespace. The statistics produced are the same as documented in the dynamic HTTP statistics section above.
Per service zone dynamic HTTP statistics
| Name | Type | Description |
|---|---|---|
| upstreamrq<xx> | Counter | Aggregate HTTP response codes (e.g., 2xx, 3xx, etc.) |
| upstreamrq<> | Counter | Specific HTTP response codes (e.g., 201, 302, etc.) |
| upstream_rq_time | Histogram | Request time milliseconds |
Statistics for monitoring load balancer decisions. Stats are rooted at cluster.. and contain the following statistics:
Load balancer subset statistics
Statistics for monitoring load balancer subset
| 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 |
