In your BlazeMeter Test Report you can view and monitor the logs of each engine used during the test run via the Logs Report, ensuring full test transparency.

By clicking on the drop-down list you will be presented with each engine's logs and artifacts.zip file, along with BlazeMeter's own System Log.

Each load engine generates its own logs and artifacts.

• Test Artifacts
• The BZT Log
• The JMeter Log
• The System Log

Test Artifacts

BlazeMeter engines run on Taurus.  Taurus collects all test files in an artifacts directory on each engine, which BlazeMeter zips up at the end of each test run.  Click artifacts.zip to download it.

This ZIP file includes:

• The test script in your test configuration -- This will either be a script you uploaded or a script BlazeMeter auto-generated in order to run your test.
• A copy of the script that shows any modifications BlazeMeter made prior to running it.  The file name will have a modified_ prefix.
• Various Taurus YAML files.  If you uploaded your own YAML configuration file, it will appear here, along with additional versions showing any modifications BlazeMeter made to it.  If you did not upload a YAML, BlazeMeter will auto-generate its own.
• The bzt.log.  This is the same one you can view individually (refer to The BZT Log in this document).
• Various log files generated by whatever testing tool you had opted to run the test with.
• If you ran a JMeter test, JTL files containing the results of the test run will be included.  These can be handy for debugging if you load them into a View Results Tree or similar listener in JMeter.
• Any additional files you might have used for that test run (such as CSV data files, for example).

A summary of the files included this ZIP file is displayed as well:

CAUTION!  If you terminated the test instead of shutting it down gracefully, or if the test ended prematurely in an unexpected manner, the artifacts.zip will not be generated.

The BZT Log

Taurus's command-line tool is called "bzt", thus the log Taurus generates during a test is called the bzt.log.  This log details all activities performed with by the engine and the tail of this log (most recent 200 rows) can be viewed live while the test is running. This capability is really helpful for debugging tests in real time!

Consider the tail of the log in this example, in which an error is shown that gives a better perspective on why the test stopped prematurely:

You can then click the bzt.log link to download the entire log file, or you can download it via the artifacts.zip, which a copy of the log is included in.

The JMeter Log

If you ran a JMeter test, then the jmeter.log will appear in the log drop-down menu as well.

Much of the content of the jmeter.log is actually included in the bzt.log, but the full jmeter.log can be very useful for troubleshooting JMeter-specific issues. 

Click the jmeter.log link to download the full log file, or you can download it via the artifacts.zip, which a copy of the log is included in.

The System Log

You can review BlazeMeter's own log by clicking the System Log button.

More often than not, the other logs mentioned above will be far more useful in troubleshooting issues, since they relate directly to the test scrip executed, whereas the System Log simply gives you a high-level view of the test's life-cycle, from the moment the test starts to when it's terminated. 

For Multi-Tests, this log can be filtered by session.