[lannuttia]

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Make tracing-journald optional behind the systemd feature flag, which is enabled by default. This provides:

• Smaller binaries for non-systemd systems
• Removes irrelevant journald error message on non-systemd systems
• Zero breaking changes (systemd feature enabled by default)

Fixes #2466

[lannuttia]

@mmstick, This should be ready for review.

[Drakulix]

LGTM. Just needs a rebase

[jklgrasso]

Looks good. Please resolve the conflict, then I will approve

[Drakulix]

sorry for getting back at this so late. could you rebase?

[lannuttia]

@Drakulix, Got it rebased and should be ready to go.