For now, please read the Lightstep PHP API docs.
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Observability gives you the necessary information about the health and efficiency of your system. However, systems are large and complex, so the question is what do you decide to measure and where do you start?
If you've instrumented your app using a Lightstep auto-installer, or if you've only just started instrumenting individual services, you'll likely need to add spans to create traces from a complete request.
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.