Werk #15258: Removed StatsGroupBy header from Livestatus protocol

Component	Livestatus
Title	Removed StatsGroupBy header from Livestatus protocol
Date	Jul 28, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The StatsGroupBy header has been deprecated for almost 13 years now, just use the Columns instead.

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