For any support request for Blackfire on Magento Cloud, please gather logs as follows and send us a full copy.
- Display startup errors and save the output.
magento-cloud ssh "php -d display_startup_errors=on --ri blackfire" - Create a temporary log file.
magento-cloud variable:create --name php:blackfire.log_file --value /tmp/blackfire.log - Set the logging level.
magento-cloud variable:create --name php:blackfire.log_level --value 4 - Start a profile/build again and collect the logs.
magento-cloud ssh "cat /tmp/blackfire.log" > blackfire.log - Send us the output.
Please then make sure to disable the Blackfire logs
You can disable logging by cleaning the temporary log file and removing the log level:
magento-cloud variable:delete php:blackfire.log_file
magento-cloud variable:delete php:blackfire.log_level