Werk #12986: apt: Handle Security Updates Line

Component	Checks & agents
Title	apt: Handle Security Updates Line
Date	Jul 16, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Newer versions of the Linux command apt display something like "10 standard security updates" or "3 esm-infra security updates" if security updates are available. Up to now, the corresponding check plugin apt was not able to handle this line. If such a line was present, the service "APT Updates" was not discovered or went stale if already discovered.

This has been fixed.

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