Is your feature request related to a problem? Please describe.

When perf isn't in $PATH, the "Start Recording" button in "File" > "Record Data" is disabled. However, the reason isn't communicated to the user.

Describe the solution you'd like

Indicate to the user that the problem is that perf isn't in $PATH (usually because it's not installed).

Describe alternatives you've considered

Add perf as a dependency. It wouldn't make much sense as a mandatory one, but would as an optional one.