How to register "mod_alias" logs into error_log file

I am testing redirect rules in a htaccess file.
I am using

LogLevel alert rewrite:trace6

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to register logs for "mod_rewrite" module into error_log file however, I do not know how to register log for "mod_alias" modules. when I use mod_alias redirect rules such as redirect / redirectmatch , error_log display only "pass through"