I don’t get anything in the error log. This is the access log entry with obfuscated key.
empate-consulting.de 0 78.94.39.230 – – [12/Jun/2023:11:55:13 +0200] “GET /wp-content/plugins/gitium/gitium-webhook.php?key=xxxxxxxxxxxxxxxxxxxx HTTP/2.0” 500 0 “https://empate-consulting.de/wp-admin/admin.php?page=gitium%2Fgitium-settings.php” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36”