If your CF8 installation starts without error, but returns an error 500 stating something like...
"500 the monitoring service is not available"
...on each request, then probably your neo-monitoring.xml is corrupt. This solution did the trick for me:
-Rename or delete the corrupt {cf_dir}/lib/neo-monitoring.xml
-Restart CF
CF then creates a new neo-monitoring.xml, but totally refuses to work if this file has 0 bytes.

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Hi, I cannot find a contact form. I work with Akismet which I believe is in use here and I would like to discuss this if possible. Could you drop me an email at all please? And it's not a money issue :)