Two cvars. mm_decisionLog is a bitmask (sum the categories you want; 32767 = everything); mm_decisionDbg 1 streams each message to the debug log live instead of batching into the info log. There is also a separate join log. 

-- Matchmaker decision-log verbosity bit mask (ConfigureMatchmaker):
-- 0 off; 1 PvP, 2 PvP join-in-progress, 4 PvP candidates, 8 coop,
-- 16 coop join-in-progress, 32 PvE, 64 universe, 128 brawl, 256 brawl candidates,
-- 512 hunger games, 1024 one against all, 2048 zombie, 4096 three teams,
-- 8192 close distance, 16384 common decisions. Example 33 = basic PvP + PvE.
cvars.mm_decisionLog = 0
-- 0 accumulate one block to info log; 1 each message to debug log.
cvars.mm_decisionDbg = 0
-- Join-attempt detail (ConfigureShard): 0 off, any higher number on.
cvars.mm_decisionLog = 0
Debug recipe: set log to 1+32+8+64 = 105 plus dbg 1, reproduce the stuck queue, read the debug log, then set both back to 0 (logging is noisy).
Additional Notes: 

Set back to 0 after debugging.

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3 + 15 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.