For now, please read the LightStep PHP API docs.
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While distributed tracing can give you a great picture of the health and efficiency of your system, the information you get is only as good as the information you provide through instrumentation of your app. Too little and you may not find the actual root cause of an issue. Too much, or focusing too far down in the stack, and you'll end up with noise that distracts from the real issues.
Once you've implemented your tracers and confirmed that they are communicating with your LightStep Satellite, it's time to add spans to your operations and connect the spans together to create a full trace that you can observe in LightStep.
This Quick Start will have you configure your tracer to communicate with the LightStep Satellites and create a single span on your PHP service. You install the LightStep tracer and then use the LightStep API to instrument your code.