There are approximately 700 occurrences of this AMC error reported in Logstash. There are about 600 possibly related errors.
{ "_index": "logstash-syslog-2019.08.28", "_type": "syslog", "_id": "AWzZMU6DaTyU0YVHMdG1", "_version": 1, "_score": null, "_source": { "@timestamp": "2019-08-28T17:06:22.956Z", "level": "ERR", "host": "mw1322", "@version": "1", "program": "php7.2-fpm", "message": "PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function MobileFrontend\\AMC\\Manager::__construct(), 2 passed in /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/ServiceWiring.php on line 48 and exactly 3 expected in /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/amc/Manager.php:53\nStack trace:\n#0 /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/ServiceWiring.php(48): MobileFrontend\\AMC\\Manager->__construct(Object(GlobalVarConfig), Object(MobileContext))\n#1 /srv/mediawiki/php-1.34.0-wmf.19/includes/libs/services/ServiceContainer.php(458): Wikimedia\\Services\\ServiceContainer->{closure}(Object(MediaWiki\\MediaWikiServices))\n#2 /srv/mediawiki/php-1.34.0-wmf.19/includes/libs/services/ServiceContainer.php(427): Wikimedia\\Services\\ServiceContainer->createService('MobileFrontend....')\n#3 /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/ServiceWiring.php(52): Wikimedia\\Services\\ServiceContainer->getService('MobileFrontend....')\n#4 /srv/medi in /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/amc/Manager.php on line 53", "logsource": "mw1322", "type": "syslog", "facility": "daemon", "normalized_message": "PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function MobileFrontend\\AMC\\Manager::__construct(), 2 passed in /srv/mediawiki/php-1.34.0-wmf.19/extensions/MobileFrontend/includes/ServiceWiring.php on line 48 and exactly 3 expected in ", "timestamp": "2019-08-28T17:06:22.823862+00:00", "tags": [ "input-kafka-rsyslog-shipper", "rsyslog-shipper", "kafka", "truncated_by_filter_truncate", "syslog", "es", "normalized_message_trimmed" ] }, "fields": { "@timestamp": [ 1567011982956 ] }, "sort": [ 1567011982956 ] }
These errors go back about three weeks but recently spiked again.