Logging::runtimeDiagnostic()logsE_WARNING,E_USER_WARNINGand recoverable errors at error level, so they reachERROR_ALERT_EMAILlike other failures. Notices and deprecations stay warnings and send nothing.- Each record names the warning and its file and line from the release root, for example
PHP warning: Undefined array key "id" in public/mail.php:817, so each different warning is its own alert, still at most one per ten minutes.
PHP warnings send an alert email
A PHP warning on the site, such as an undefined array key, is now logged as an error and emailed to the error alert address.