Werk #16607: Handle the uptime of Docker containers across time zones

Component

Checks & agents

Title

Handle the uptime of Docker containers across time zones

Date

Apr 12, 2024

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.4.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0b6	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

As of version 2.3, the uptime monitoring service for Docker containers could crash if the container's start time was later than the current CheckMk site's current time. This resulted in a negative uptime calculation error (ValueError: "Cannot render negative timespan"). This could occur in situations where the host system and the container had different configured timezones.

We now correctly handle all timestamps, ensuring accurate uptime calculations regardless of timezone configurations.

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