Health check
Health check filter architecture overview
This filter should be configured with the type URL
type.googleapis.com/envoy.extensions.filters.http.health_check.v3.HealthCheck.
Note
Note that the filter will automatically fail health checks and set the x-envoy-immediate-health-check-fail header on all responses (both health check and normal requests) if the /healthcheck/fail admin endpoint has been called. (The /healthcheck/ok admin endpoint reverses this behavior).
Statistics
The health check filter outputs statistics in the http.<stat_prefix>.health_check. namespace. The
stat prefix
comes from the owning HTTP connection manager.
Name |
Type |
Description |
|---|---|---|
request_total |
Counter |
Total number of requests processed by this health check filter ()including responses served from the cache) |
failed |
Counter |
Total number of health checks that failed (including failures due to cluster status and responses served from the cache) |
ok |
Counter |
Total number of health checks that passed |
cached_response |
Counter |
Total number of requests that were responded to with cached health check status |
failed_cluster_not_found |
Counter |
Total number of failed health checks due to referenced cluster not being found |
failed_cluster_empty |
Counter |
Total number of failed health checks due to empty cluster membership when checking cluster health |
failed_cluster_unhealthy |
Counter |
Total number of failed health checks due to cluster falling below minimum healthy percentage threshold |
degraded |
Counter |
Total number of health check responses that reported degraded status |