Using php-fpm and nginx in a docker container. My custom php error handler builds a comprehensive JSON data and outputs it using error_log(). But somehow it is always prefixed with NOTICE: PHP message:, which ruins the JSON format reader in Grafana - because now the output is not a valid json string.
How do I stop it from prefixing my log strings?
Answer
You could just bypass the PHP logging by directly writting to a log file using file_put_contents
file_put_contents('/var/log/your.log', json_encode($data) . PHP_EOL, FILE_APPEND);
This avoids the NOTICE: PHP message: prefix and will produce a clean JSON to be uploaded to Grafana.