Werk #11405: Improved performance of agent bakery

With the introduction of the new Bakery API (see Werk #11401), the Agent Bakery itself has undergone a complete overhaul.

While baking agents, the agent bakery now tries to reuse as many resources as possible, instead of collecting data for every package separately. If the contents for a to-be-baked package are identical to an already-baked one, this optimization will be communicated as "fast repackage" (visible at the bake-agents background job within the GUI or at the console directly when baking on the command line).

Furthermore, the packaging processes for RPM and DEB packages have been optimized in performance.

In summary, you will experience an agent bakery that runs noticeably faster and finishes earlier, compared to Checkmk 1.6 and before.

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