Performance telemetry

[psfinaki]

Note This is a "meta" issue for tracking purposes since GitHub does not support special types of issues.

We can collect data about F# performance to have an overview of areas to optimize.

Some ideas:

• Intellisense (e.g. typed character to intellisense list time)
• Initial type-checking and re-checking
• Opened document to diagnostics time
• Opened document to highlighting time

@vzarytovskii, @T-Gro feel free to dump more here. Meanwhile I will ask around how other teams do this.

[T-Gro]

Definitely anything related to hangs and leading to why they happened in the first place:

• number of background tasks running if higher than a treshold
• waiting times on locks (dedicated event if longer than a few seconds)
• uncaught exceptions in service operations (except for OperationCanceledException which has token matching the one the service operation passed in)