Log Analytics lets you import any web server log file. In this FAQ we will focus on one particular type of logs that you may find useful to import in Piwik: the Piwik tracking API logs.

What are Piwik Tracking API logs?
When users visit your websites the Piwik JavaScript tracking code will send a HTTP(S) request to piwik.php Tracking API endpoint. If you use one of the Tracking API clients to measure your mobile apps or games or desktop apps, they will also send requests to piwik.php. Your webserver handling those requests will create access log files containing the tracking data that Piwik will collect in your database.

Uses of replaying logs
Replaying logs is very useful for example when your database server breaks down and Piwik could not write the data for a few hours. Luckily you can use your web server logs matching /piwik.php and replay them into Piwik. Replaying logs means that the Log Analytics tool will go through each line of the log and import them in your Piwik for the correct datetime in the past. Replaying logs is also useful if you want to setup High availability Piwik.

How to replay Tracking API logs?
Firstly you would prepare a log file containing only the requests that should imported. Typically you would import only a given period of time.

To replay the tracking API logs you then call the log analytics importer with --replay-tracking parameter such as:

./misc/log-analytics/import_logs.py --url=piwik.example.net --replay-tracking /var/log/apache2/access.log 

After replaying the logs it is recommended to reprocess the data with the core:archive console command.

Any questions?

Many answers and more information about Piwik You can find here:

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