davidwtalley on "WordPress database error Table 'wordpress-db.dc_login_log'"

Hello, WP geniuses. I get the note below from our server administrator. Any suggestions? My first thought was a plug-in referencing an outdated table structure, but we have no login-related plug-ins running (no obvious ones, anyway).

We're on v4.5.2 running multi-site with four sites. Any (polite) suggestions are welcome! Thanks!

I'm seeing about 10k errors logged in the last rotation with the same error message:

WordPress database error Table 'wordpress-db.dc_login_log' doesn't exist for query SHOW FULL COLUMNS FROM dc_login_log made by login_header, apply_filters('login_errors'), call_user_func_array, login_widget_admin_security->check_afo_login_failed, login_log_adds->log_add