[asherkin]

They should get cleaned up on exit, or via your system's normal tmp dir cleanup if SRCDS is regularly existing abnormally for some reason. The files contain metadata for doing performance profiling and debugging of SourcePawn plugins with the "perf" suite of linux tools.

The files are small, low impact, and sometimes useful, but you can turn generating them off by setting the "JITMetadata" option in core.cfg to "none".