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For authentication schemes using ephemeral usernames, this causes memory leaks, as old metrics are never garbage collected.
supersven
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May 31, 2022
sysvinit
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Nov 8, 2022
```
==6418==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x4e7530 in bcmp /src/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:906:10
#1 0x55463d in stun_check_message_integrity_by_key_str coturn/src/client/ns_turn_msg.c:1989:5
#2 0x554acc in stun_check_message_integrity_str coturn/src/client/ns_turn_msg.c:2008:9
#3 0x5358c0 in LLVMFuzzerTestOneInput coturn/fuzz/FuzzStun.c:37:5
#4 0x43ede3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#5 0x42a542 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
#6 0x42fdec in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
#7 0x459322 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#8 0x7f4cb21790b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
#9 0x42070d in _start
Uninitialized value was created by an allocation of 'new_hmac' in the stack frame of function 'stun_check_message_integrity_by_key_str'
#0 0x5538c0 in stun_check_message_integrity_by_key_str coturn/src/client/ns_turn_msg.c:1927
```
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Old metrics labels are never garbage collected, which means that authentication schemes which use ephemeral usernames (such as the TURN REST API and the similar
zrestscheme) will cause memory leaks due to the generation of new labels for every new username.This change removes the username labeling on metrics entirely. See also issue 666 in upstream.