Tolerate kafka errors in CMC realtime exporter

[IvanIvanoff]

Changes

If the kafka export function fails now, the whole genserver is killed and the scrape begins again. This makes it go into an infinite scrape cycle, exhausting the credits.

Ticket

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works