Werk #14777: Add queue usage counters to status table

Component	Livestatus
Title	Add queue usage counters to status table
Date	Nov 9, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Add 6 columns to the status table in livestatus: carbon_queue_usage, carbon_queue_usage_rate, influxdb_queue_usage, influxdb_queue_usage_rate, rrdcached_queue_usage, rrdcached_queue_usage_rate. Usage is defined as the approximate size of the queue passing the data to its connection over the total size of the queue.

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