1st line: Since program start or counter reset, OBS tried to render 5964 frames. This includes the OBS preview. None of them were discarded due to rendering lag.
2nd line: Since program start or counter reset, OBS tried to encode 0 frames. None of them were discarded due to encoding lag. OBS only does encoding if you start a stream, a recording, or the replay buffer, so you will see numbers only if you actually start one of these.