All within the span of a second or so. These repeat every 15 minutes exactly across hundreds of servers. All refer to OpsMgr PowerShell Host. We're not having any issues, and they're all informational, but I'm not really sure what's going on.
OpsMan has its own PowerShell host, which is what it uses to run PowerShell scripts. Each time it starts that host (to run a script), for some reason it's logging the fact that the various PSProviders are starting up. Totally normal, except it's a lot of noise. You can probably configure a lower level of logging someone in OpsMan.
You've likely got some shell action running in OpsMan every 15 minutes, which is what's doing it.