Instrument Your Serverless Python with Thundra

How to instrument your function manually?

To perform tracing you need to have a tracer object and span objects. Tracer starts spans.

When a function is called, the tracer will start an active span. If another function is called inside this function, another span is started for callee and added as a child span to caller’s existing span. This generates a span tree. In order to trace your functions with Thundra, you need to first create Thundra tracer and start the active span as follows:

You can also add tags to active spans manually. For instance, you may use tags for reporting errors. Example usage can be like following:

The fields for errors are also specified by OpenTracing.

By adding errors to span tags, you can see them in the Thundra Web Console.

Example Use Case

With the trace chart, you are able to see which functions take longer time than expected or if an error has occurred during the invocations. You can add any data you want to span tags so that you can see them as raw data later in the trace chart. Example usage is shown below:

Conclusion

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