Werk #15701: ps: Fill gaps in age metrics

Component	Checks & agents
Title	ps: Fill gaps in age metrics
Date	Jun 27, 2023
Level	Trivial Change
Class	Bug Fix
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) 2.2.0p5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p30 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The Process ... Service records metrics for the oldest and the youngest process age among all matching processes and displays them in the graphs Oldest age and Youngest age.

However, whenever there was only one matching process, or if all processes were of the exact same age, no oldest/youngest age was recorded, which lead to implausible gaps in the graphs.

To mitigate this issue, the two graphs will now be continued with the single age, even if it's technically the same value.

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