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I use getsentry for my Django deployments. It's awesome for automatically emailing me when a user experiences a bug in the code, and sending me the stack trace for any exceptions that occur.

Does Drupal have anything equivalent? I've seen the Drupal Sentry plugin but it doesn't look like it's under active development.

What's the best way of monitoring bugs in production for Drupal?

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You can use New Relic.

Database performance

Viewing slow SQL queries is a breeze. Most Drupal sites rely heavily on Views and CCK which can generate non-optimal SQL queries. New Relic allows you to quickly pinpoint these types of queries.

Modules Monitoring

You can identify which modules are slowest by call count or by slowest call time. This may help you identify which modules may be running rogue within your application.

Apdex

New Relic uses Apdex scoring to help you evaluate how well your Drupal application is performing for your end-users according to an industry-standard measurement. This helps you provide better data as well as have a clearer understanding of what percentage of your users are frustrated or satisfied. Apdex scoring also provides more specific context than a general “the site is slow” complaint that may not even get to you until hours after the incident. Apdex also gives you a more objective way to measure your end-users’ experience with your performance improvements.

Function Performance

Using Web Transaction Traces, you can see which functions are the slowest in your application. You can use this to identify slow functions in custom modules you have written, or to track delays in your application caused by community module functions that do things like authenticate with third-party systems.

Front-end performance

All that wonderful flexibility within blocks, views, and panels can sometimes result in complex page renderings that need to be processed by the browsers of your end-users. New Relic’s Real User Monitoring (RUM) will actually gather timing information and show you which hotspots in DOM rendering time may be causing your page to take several seconds to load.

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  • +1 for New Relic. It is very advanced APM for Drupal. Yes the paid account will give you fidelity down to the function call creating the issue.
    – Brady
    Mar 23, 2015 at 22:26
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AppDynamics has a similar tool to New Relic that allows introspection of a running php application with detailed reports and exceptions.

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