Werk #17097: Increase RSA key size for Agent Controller's client TLS certificate

Component	Checks & agents
Title	Increase RSA key size for Agent Controller's client TLS certificate
Date	Oct 17, 2024
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p19 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p36 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The Agent Controller now uses 4096-bit RSA keys for the TLS certificates required for mutual TLS authentication.

This change only affects newly generated certificates for new connections. Existing certificates remain unchanged and will continue to be accepted.

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