Werk #12193: ps: Metrics for oldest and youngest process age

Component	Checks & agents
Title	ps: Metrics for oldest and youngest process age
Date	Apr 8, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Metrics and graphs added for oldest and youngest process age.

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