Some failed SQL queries executed during the bootstrap process resulted in a generic "Unknown error" message instead of reporting the original error message received from the MySQL server.

As a workaround, setting level=DEBUG during bootstrap yielded these SQL errors. (Bug #27721898)

Some unexpected errors from the MySQL server were not shown during the Router bootstrap process. (Bug #27721834)

Router failed to compile on Alpine Linux 3.6, or on Raspberry Pi Zero or One (ARMV6). (Bug #27697883, Bug #27697767)

Router's max_connect_errors option did not function in v8.0.4. (Bug #27564958)

Bootstrapping would only function if --bootstrap was the first command-line argument. Now the argument order is irrelevant. (Bug #25054974)