Web Framework Logging

Logging is a common mechanism for monitoring web applications written with a

web framework. Runtime exceptions that prevent code from running are

important to log to investigate and fix the source of the problems.

Informational and debugging logging also helps to understand how the

application is performing even if code is working as intended.

Logging is often grouped into several categories:

1. Information

2. Debug

3. Warning

4. Error

Logging errors that occur while a web framework is running is crucial to

understanding how your application is performing.

`Raven <http://raven.readthedocs.org/en/latest/>`_ is a Python client for the

`Sentry <https://github.com/getsentry/sentry>`_ exception logging and

aggregation application. Raven provides the way to send exceptions to

Sentry, which should be deployed on a separate server from your production

infrastructure. Raven can also be used by Python scripts to send other

log data to Sentry for aggregation. Sentry provides a clean web application

interface for viewing the exceptions. Sentry can also be configured with a

mail plugin to send emails when exceptions occur.

Logging Aggregators

When you are running your application on several servers, it is helpful

to have a monitoring tool called a "logging aggregator." You can configure your

application to forward your application and system logs to one place that

allows you to view, search, and monitor logging events across all of your machinces.

Another advantage of log aggregators tools is they allow you to set up custom alerts

and alarms so you can get notified when error rates breach a certain threshold

Log Aggregator Third Party Services

`loggly <https://www.loggly.com/>`_ Loggly is a third party cloud based application that

aggregates logs. They have instructions for every major language, including python. It includes email

alerting on custom searches.

`splunk <http://www.splunk.com/>`_ Splunk offers third party cloud and self hosted solutions

for event aggregation. It excells at searching and data mining any text based data.

Open Source Projects

`Logstash <http://logstash.net/>`_

`Graylog2 <http://graylog2.org/>`_ Provides a central server for log aggregation as well as a GUI for

browsing and searching through log events. There are libraries for most major languages, including python.

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