[llvm] [llvm]Add a simple Telemetry framework (PR #102323)

[Vy Nguyen via llvm-commits]

oontvoo wrote:

> I've been thinking about it a bit more, and I think that it would make sense to have a single upstream implementation that writes a representation of some kind (JSON is fine) to a file. This would be off by default, but could be enabled via an option somehow (perhaps keep it in LLVM-only code and add a runtime option). This would have two benefits: 1) it would serve as a concrete example for vendors how to extend the interface, and 2) it could be used for testing the basic telemetry information is working in an end-to-end manner, via lit tests, in a way that the current unit tests can't really show. Thoughts?

Both (1) and (2) can be archived via the the test implementation.
I've mentioned this in the library header comment, but we don't want to accidentally have telemetry data "leaked" by any chance - even if it's just to a local file, which could still be problematic.
In various discussions, people were already slightly nervous with certain piece of data being collected (again, different vendors/organisations have different privacy/security models, hence they have different opinions on which data should be collected and whether if it's ok for such data to be "forwarded" anywhere by LLVM).

 


https://github.com/llvm/llvm-project/pull/102323