Knative Eventing metrics

Administrators can view metrics for Knative Eventing components.

Broker - Ingress

Use the following metrics to debug how broker ingress performs and what events are dispatched via the ingress component.

By aggregating the metrics over the http code, events can be separated into two classes, successful (2xx) and failed events (5xx).

Metric Name	Description	Type	Tags	Unit	Status
event_count	Number of events received by a Broker	Counter	broker_name event_type namespace_name response_code response_code_class unique_name	Dimensionless	Stable
event_dispatch_latencies	The time spent dispatching an event to a Channel	Histogram	broker_name event_type namespace_name response_code response_code_class unique_name	Milliseconds	Stable

Broker - Filter

Use the following metrics to debug how broker filter performs and what events are dispatched via the filter component. Also user can measure the latency of the actual filtering action on an event. By aggregating the metrics over the http code, events can be separated into two classes, successful (2xx) and failed events (5xx).

Metric Name	Description	Type	Tags	Unit	Status
event_count	Number of events received by a Broker	Counter	broker_name container_name= filter_type namespace_name response_code response_code_class trigger_name unique_name	Dimensionless	Stable
event_dispatch_latencies	The time spent dispatching an event to a Channel	Histogram	broker_name container_name filter_type namespace_name response_code response_code_class trigger_name unique_name	Milliseconds	Stable
event_processing_latencies	The time spent processing an event before it is dispatched to a Trigger subscriber	Histogram	broker_name container_name filter_type namespace_name trigger_name unique_name	Milliseconds	Stable

In-memory Dispatcher

In-memory channel can be evaluated via the following metrics. By aggregating the metrics over the http code, events can be separated into two classes, successful (2xx) and failed events (5xx).

Metric Name	Description	Type	Tags	Unit	Status
event_count	Number of events dispatched by the in-memory channel	Counter	container_name event_type= namespace_name= response_code response_code_class unique_name	Dimensionless	Stable
event_dispatch_latencies	The time spent dispatching an event from a in-memory Channel	Histogram	container_name event_type namespace_name= response_code response_code_class unique_name	Milliseconds	Stable

Note

A number of metrics eg. controller, Go runtime and others are omitted here as they are common across most components. For more about these metrics check the Serving metrics API section.

Eventing sources

Eventing sources are created by users who own the related system, so they can trigger applications with events. Every source exposes by default a number of metrics to help user monitor events dispatched. Use the following metrics to verify that events have been delivered from the source side, thus verifying that the source and any connection with the source work as expected.

Metric Name	Description	Type	Tags	Unit	Status
event_count	Number of events sent by the source	Counter	event_source event_type name namespace_name resource_group response_code response_code_class response_error response_timeout	Dimensionless	Stable
retry_event_count	Number of events sent by the source in retries	Counter	event_source event_type name namespace_name resource_group response_code response_code_class response_error response_timeout	Dimensionless	Stable