Multiline input codec not working (php stacktrace)

Hi folks,

I'm running logstash 6.4 with a gelf login using the multiline codec, and I can't get it to recognise the pattern. Ideally the pattern I want to attach to the previous line is ^(#|StackStrace), but I'm failing with even just ^#. The source is docker logs streaming, so I can't do multiline beforehand.

input {
    gelf {
        port => 12201
        tags => ['gelf']
        codec => multiline {
            pattern => "^#"
            negate => false
            what => previous
            auto_flush_interval => 1

Example stack trace:

[2019-08-15 07:45:33] api[].ERROR: Directus\Exception\UnauthorizedException: Unauthorized request in /var/www/myapp/src/helpers/app.php:268
Stack trace:
#0 /var/www/myapp/vendor/slim/slim/Slim/App.php(530): Directus\{closure}
#1 /var/www/myapp/src/core/Directus/Application/Http/Middleware/CorsMiddleware.php(66): Slim\App->__invoke
#2 [internal function]: Directus\Application\Http\Middleware\CorsMiddleware->__invoke
#3 /var/www/myapp/vendor/slim/slim/Slim/DeferredCallable.php(43): call_user_func_array
#4 [internal function]: Slim\DeferredCallable->__invoke
#5 /var/www/myapp/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func
#6 /var/www/myapp/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim\{closure}
#7 /var/www/myapp/vendor/slim/slim/Slim/App.php(405): Slim\App->callMiddlewareStack
#8 /var/www/myapp/vendor/slim/slim/Slim/App.php(313): Slim\App->process
#9 /var/www/myapp/src/core/Directus/Application/Application.php(161): Slim\App->run
#10 /var/www/myapp/public/index.php(5): Directus\Application\Application->run [] []

I've tried various regexes and flipping negate in various ways. The lines are never multilined when viewed in Kibana.

Does anyone have an idea as to what I'm doing wrong?



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