• Rating — an overall score of how useful a player was in the match; 1.00 is average.
• KAST — the share of rounds where a player got a kill, an assist, survived or traded.
• Damage — average damage per round.
• Entry frag — opening kills and the share of them that worked out.
• Clutch — a round won alone against several opponents.
• Multi-kills — rounds with two or more frags.

The numbers cover the whole match: the game plugin does not record round numbers, so there is no «which round the clutch happened in» timeline here.