Lock Leone Nakarawa also delivered an all-action display and he was the one to make way for Kellock, who started from the bench, 15 minutes before full-time.
Kellock, 33, has spent nine years at the Warriors but will not be waving goodbye completely as he now goes on to take up an ambassadorial role with Scottish Rugby.
And he insists Glasgow's collective effort in his final game could not have been better.
"There'll be plenty of time for individual reflection, we're just collectively enjoying something incredibly special," said Kellock.
"As soon as Gregor (Townsend) told me what my role was going to be in the game and I tried to make sure I focused on that as much as possible.
"I haven't been on the bench very much for Glasgow - I think that was my fifth time - but it's about making sure you've got the detail right.
"It's quite nice going on with 15 minutes to go when you're three scores up!
"That was testament to what had gone on, it was very difficult against a very, very good Munster team. When they got hold of the ball and their driving lineout got going, it was very tough.
"But some of the rugby we produced was the best we had produced all season. It was not only the attack, which will always stand out when you score four tries, but the defence to stop them doing what Munster are the best at the league at with all their big ball carriers."
And Kellock also tipped his hat to the outstanding Nakarawa, who set up tries for van der Merwe and Harley.
"Some of the offloading was terrific, big Naksy (Nakarawa), I've spoken to him so much over the last few weeks one of the key messages we'd been hammering into him all week was to carry hard and make three or four of them put you down - then he got off two and we scored two tries!
"He's a special player, and I think he was the best player on the park for a mile."
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