More or Less Collectors Moving to Azure

Gaps are not normal, that is sign that you have either collector issues or network issues. If I read those graphs correctly, those are gaps of like 12+ hours which is huge.

I would first look for patterns in the gaps. Are the gaps always at the same time? They just occur during the day or also at night? Any difference between weekday vs weekend? Do they occur across multiple devices at the same time? Do devices on different collectors show the same gap at the same time? Do the gaps show up in more basic checks like ping and/or just more complex checks? Do the gaps only show for particular types of devices (network vs servers)? Do they only occur for particular network segments?

If you can catch the issue when it's actively showing No Data, try doing Poll Now and see if you are getting error messages as Poll Now can provide extra details. Run the collector debug console and check !tlist with !tdetail so see what the last results of those checks have been. Log into the collector server directly and try running equivalent commands. If WMI checks fail in LM, try using Get-WMIObject powershell. If snmp fails, try using the !snmpdiagnose debug command or 3rd party snmp tool.

Also look at the Collector log files for the time of the gap. They should show lots of information of what the collector attempted and if it got any errors.

Good luck!