I'm seeing these regularly, with intervals varying between a few seconds and about 15 minutes. I can't see any other events or actions that might be related to it. I've seen this both in my clean 8.2.4 installation and my previous 8.2.3. The latter has been updated several times over the years but I couldn't say which version it started on.
My devices:
- 238 switches (Cisco 3560, Aruba S1500 and Aruba 2930F)
- 715 access points (AP-105, AP-115, AP-134, AP-135, AP-205, AP-225 and RAP3)
- Aruba 7220 running ArubaOS 8.1.0.1.
I got the Client Monitor Worker messages while I was running ArubaOS 6.x and minimal SNMP traps on the 7220 as well. As I'm unsure when the problem started, I can't say whether adding new types of switches and access points might have triggered it.
As far as i know it doesn't cause any trouble, but it's filling up my event log. And I'm not too comfortable with ignoring seemingly inconsequential errors.