Papertrail is described as 'Hosted log management for servers, apps, and cloud services. Papertrail aggregates syslog, Text log files, Apache, MySQL, cloud hosting, Ruby on Rails, Windows events, Tomcat, Heroku apps, and routers & firewalls' and is a web log analyzer in the network & admin category. There are more than 25 alternatives to Papertrail, not only websites but also apps for a variety of platforms, including Linux, Windows, Mac and SaaS apps. The best Papertrail alternative is Grafana, which is both free and Open Source. Other great sites and apps similar to Papertrail are Datadog, Graylog, Prometheus and Open Web Analytics.
Papertrail is for logs Grafana is for metrics