# Functions
NewThrottler returns an instance of Throttler.
# Structs
CRDEventHandler pushes an event to ResourceGroup event channel when the CRD or its CRs are contained in some ResourceGroup CRs.
EnqueueEventToChannel pushes an event to ResourceGroup event channel instead of enqueue a Reqeust for ResourceGroup.
Throttler only pushes a request to ResourceGroup work queue when there is no same event in the queue.