Stackdriver has a limit on the cardinality of fields on a metric, and event types can be any custom string.

NewBrokerCellLatencyReporter creates a new BrokerCellLatencyReporter.

NewDeliveryReporter creates a new DeliveryReporter.

NewIngressReporter creates a new StatsReporter.

StartEventProcessing records the start of event processing for delivery within the given context.

Create the tag keys that will be used to add tags to our measurements.

IngressReporter reports ingress metrics.