Runtime¶

Upstream clusters support the following runtime settings:

Active health checking¶

health_check.min_interval: Min value for the health checking interval. Default value is 1 ms. The effective health check interval will be no less than 1ms. The health checking interval will be between min_interval and max_interval.
health_check.max_interval: Max value for the health checking interval. Default value is MAX_INT. The effective health check interval will be no less than 1ms. The health checking interval will be between min_interval and max_interval.
health_check.verify_cluster: What % of health check requests will be verified against the expected upstream service as the health check filter will write the remote service cluster into the response.

Outlier detection¶

See the outlier detection architecture overview for more information on outlier detection. The runtime parameters supported by outlier detection are the same as the static configuration parameters, namely:

outlier_detection.consecutive_5xx: consecutive_5XX setting in outlier detection
outlier_detection.consecutive_gateway_failure: consecutive_gateway_failure setting in outlier detection
outlier_detection.consecutive_local_origin_failure: consecutive_local_origin_failure setting in outlier detection
outlier_detection.interval_ms: interval setting in outlier detection
outlier_detection.base_ejection_time_ms: base_ejection_time setting in outlier detection
outlier_detection.max_ejection_percent: max_ejection_percent setting in outlier detection
outlier_detection.enforcing_consecutive_5xx: enforcing_consecutive_5xx setting in outlier detection
outlier_detection.enforcing_consecutive_gateway_failure: enforcing_consecutive_gateway_failure setting in outlier detection
outlier_detection.enforcing_consecutive_local_origin_failure: enforcing_consecutive_local_origin_failure setting in outlier detection
outlier_detection.enforcing_success_rate: enforcing_success_rate setting in outlier detection
outlier_detection.enforcing_local_origin_success_rate: enforcing_local_origin_success_rate setting in outlier detection
outlier_detection.success_rate_minimum_hosts: success_rate_minimum_hosts setting in outlier detection
outlier_detection.success_rate_request_volume: success_rate_request_volume setting in outlier detection
outlier_detection.success_rate_stdev_factor: success_rate_stdev_factor setting in outlier detection
outlier_detection.enforcing_failure_percentage: enforcing_failure_percentage setting in outlier detection
outlier_detection.enforcing_failure_percentage_local_origin: enforcing_failure_percentage_local_origin setting in outlier detection
outlier_detection.failure_percentage_request_volume: failure_percentage_request_volume setting in outlier detection
outlier_detection.failure_percentage_minimum_hosts: failure_percentage_minimum_hosts setting in outlier detection
outlier_detection.failure_percentage_threshold: failure_percentage_threshold setting in outlier detection
outlier_detection.max_ejection_time_ms: max_ejection_time setting in outlier detection

Core¶

upstream.healthy_panic_threshold: Sets the panic threshold percentage. Defaults to 50%.
upstream.use_http2: Whether the cluster uses HTTP/2 if configured in HttpProtocolOptions <envoy_v3_msg_config.upstreams.http.v3.HttpProtocolOptions>. Set to 0 to disable HTTP/2 even if the feature is configured. Defaults to enabled.
upstream.use_http3: Whether the cluster uses HTTP/3 if configured in HttpProtocolOptions <envoy_v3_msg_config.upstreams.http.v3.HttpProtocolOptions>. Set to 0 to disable HTTP/3 even if the feature is configured. Defaults to enabled.

Zone aware load balancing¶

upstream.zone_routing.enabled: % of requests that will be routed to the same upstream zone. Defaults to 100% of requests.
upstream.zone_routing.min_cluster_size: Minimal size of the upstream cluster for which zone aware routing can be attempted. Default value is 6. If the upstream cluster size is smaller than min_cluster_size zone aware routing will not be performed.

Circuit breaking¶

circuit_breakers.<cluster_name>.<priority>.max_connections: Max connections circuit breaker setting
circuit_breakers.<cluster_name>.<priority>.max_pending_requests: Max pending requests circuit breaker setting
circuit_breakers.<cluster_name>.<priority>.max_requests: Max requests circuit breaker setting
circuit_breakers.<cluster_name>.<priority>.max_retries: Max retries circuit breaker setting
circuit_breakers.<cluster_name>.<priority>.retry_budget.budget_percent: Max retries circuit breaker setting
circuit_breakers.<cluster_name>.<priority>.retry_budget.min_retry_concurrency: Max retries circuit breaker setting