Werk #11906: Improve message length computation in fetcher protocol

Component	Core & setup
Title	Improve message length computation in fetcher protocol
Date	Feb 17, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b7 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The computation of the length of SNMP payloads is now consistent with improperly escaped JSON strings.

Previously, the inconsistency could result in the crash of the SNMP checks.

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