There are approximately 700 occurrences of this AMC error reported in [[ https://logstash.wikimedia.org/goto/0fa20165afd75ab19f4726795878ab28 | Logstash ]]. There are about 600 possibly related errors.
```lines=15,lang=json,name=Trace
{
"_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.