If you are trying to monitor your application's log files, we recommend using a Rollbar notifier library instead (or in addition, in the case of PHP--see next paragraph). The Rollbar notifiers are easier to install and use and will gather more context about each error. See https://rollbar.com/docs for a list of supported languages and links to notifiers. Today, the primary use of rollbar-agent is to provide durable, asynchronous reporting from PHP applications that are instrumented with rollbar-php. If you are using PHP and performance is important, you'll want to set up rollbar-agent.