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[tracing] CP-43769: instrument serialize_auth with a Named_mutex
Instrument 'serialize_auth' with a Named_mutex. This function is a bottleneck both for succesful and failed authentication calls, and we need to be able to see it. Eventually we should allow authentication to proceed in parallel, once we made our PAM library thread-safe: PAM itself will apply throttling, currently both XAPI and PAM do this. The throttling might still be useful for AD to prevent brute-force attacks. Signed-off-by: Edwin Török <[email protected]>
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