Truncated JsonFormatter logs at 8191 characters about monolog

[Seldaek]

Yeah sorry but that's something you'll have to debug yourself I am afraid.. There is too much environment specific stuff at play here for me to help much.

[Seldaek]

If you figure it out please share here, it may help someone else one day

[Seldaek]

AFAIK there is no such limit in Monolog itself, but I am not very familiar with ECS and there might be something else there.

[Mad4T]

Issue happens in ECS and EKS. Also worth noting that logs from none php apps are not truncated.

[Mad4T]

if we ever find the reason will post it here, but we ended up doing a workaround to truncate the logs using Processor :

<?php

namespace App\Logging;

use Monolog\LogRecord;
use Monolog\Processor\ProcessorInterface;
use Throwable;

class TruncateStackTraceProcessor implements ProcessorInterface
{
    private int $traceLimit;

    public function __construct(int $traceLimit = 30)
    {
        $this->traceLimit = $traceLimit;
    }

    public function __invoke(LogRecord $record): LogRecord
    {
        $context = $record->context;
        if (isset($context['exception']) && $context['exception'] instanceof Throwable) {
            $exception = $record['context']['exception'];
            $trace = $exception->getTrace();

            if (count($trace) > $this->traceLimit) {
                $trace = array_slice($trace, 0, $this->traceLimit);
            }

            $context['exception'] = [
                'class' => get_class($record['context']['exception']),
                'message' => $record['context']['exception']->getMessage(),
                'code' => $record['context']['exception']->getCode(),
                'file' => $record['context']['exception']->getFile() . ':' . $record['context']['exception']->getLine(),
                'trace' => $this->formatStacktrace($trace),
            ];

            $record = $record->with(context: $context);
        }

        return $record;
    }

    private function formatStacktrace(array $trace): string {
        return collect($trace)
            ->map(function ($el) {
                $file = $el['file'] ?? '[unknown]';
                $line = $el['line'] ?? '[unknown]';
                $class = $el['class'] ?? '[unknown]';
                $function = $el['function'] ?? '[unknown]';
                $type = $el['type'] ?? '->';
                return "at {$class}{$type}{$function} ({$file}:{$line})";
            })
            ->join("\n");
    }
}