[google-appengine] QueueOverflowException - Item queue overflow. Check that the batch daemon is running

[Bilal Haidar]

Hi,
>From time to time, we are having 500 error messages as shown below:

This is a PHP Laravel hosted on GCP App Engine Flex.

Any idea what's causing these errors?

{
    "message": "Item queue overflow. Check that the batch daemon is 
running.",
    "exception": "Google\\Cloud\\Core\\Batch\\QueueOverflowException",
    "file": "/app/vendor/google/cloud-core/src/Batch/SysvProcessor.php",
    "line": 78,
    "trace": [
        {
            "file": 
"/app/vendor/google/cloud-core/src/Batch/BatchRunner.php",
            "line": 141,
            "function": "submit",
            "class": "Google\\Cloud\\Core\\Batch\\SysvProcessor",
            "type": "->"
        },
        {
            "file": "/app/vendor/google/cloud-logging/src/PsrLogger.php",
            "line": 524,
            "function": "submitItem",
            "class": "Google\\Cloud\\Core\\Batch\\BatchRunner",
            "type": "->"
        },
        {
            "file": "/app/vendor/google/cloud-logging/src/PsrLogger.php",
            "line": 413,
            "function": "sendEntry",
            "class": "Google\\Cloud\\Logging\\PsrLogger",
            "type": "->"
        },
        {
            "file": 
"/app/vendor/monolog/monolog/src/Monolog/Handler/PsrHandler.php",
            "line": 66,
            "function": "log",
            "class": "Google\\Cloud\\Logging\\PsrLogger",
            "type": "->"
        },
        {
            "file": "/app/vendor/monolog/monolog/src/Monolog/Logger.php",
            "line": 317,
            "function": "handle",
            "class": "Monolog\\Handler\\PsrHandler",
            "type": "->"
        },

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