Changed

• Perf event sampling now implemented with BPF. Now requires building with BPF support.
• Renamed worker threads and set limit for total number of runtime threads instead of just core threads.

Added

• CPU sampler now includes CPU frequency.

Fixed

• BPF probes are now dropped properly on program termination. Previously, on some kernel versions, BPF probes might remain after exit.
• Memcache sampler was not being initialized. It's now re-enabled.