StartIndex is the index of the queue that starts iteration over sub queues.

StartIndexWithLocalQueue is the index of the queue that starts iteration over local and sub queues.

Mapping is a map-like data structure that allows accessing its items not only by key but also by index.

RequestQueue holds incoming requests in per-tenant queues.

SlicePool uses a bucket pool and wraps the Get() and Put() functions for simpler access.

TreeQueue is an hierarchical queue implementation where each sub-queue has the same guarantees to be chosen from.

QueueIndex is opaque type that allows to resume iteration over tenants between successive calls of RequestQueue.GetNextRequestForQuerier method.

Request stored into the queue.