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Werk #15495: Fix generation of report preview in background job

Component Reporting & availability
Title Fix generation of report preview in background job
Date Jun 9, 2023
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0p30 Checkmk Pro, Checkmk Ultimate MT

If you used "Generate report preview in background job" on the report scheduler page, the background job failed with an error like "Exception: content argument must be Text, not bytes".

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