pub fn flush_performance()Expand description
Delivers whatever has been tallied so far right now, instead of waiting for the next
performance_flush_interval tick. The background flush thread is a daemon: it does not run on
a normal process exit the way the Ruby gem’s at_exit hook does (Rust has no equivalent), so a
short-lived program, or one about to shut down, should call this itself to avoid losing the
last partial window.