Sumo Logic

Is a Log Management tool where you could integrate all the logs from the application and query through the logs .

Can easily query the integrated application to track the kind devices used to open your application if mobile device or desktop was used to open the application and many more details.

Aggregation operations can also be done and counts could also be generated.

How many 5 xx errors and from which part of application could be checked by writing a script.

Alerts could be set up so that if the application starts throwing 5xx error a mail or alert is sent to the dedicated groups.

This tool could also be used to set a kind of check if the application is not loading or throwing some error.

For more details:

https://help.sumologic.com/ja/docs/dashboards-new/create-a-dashboard-new