Remove manual rate limiting and fix GlobalTracer reset

[allenisalai]

The sample rate is sent to the Datadog agent and is used even when manual profiling like this project does so the sampling logic in the DataDogProfiler is causing the sampling rate to be applied twice.

In addition the Global tracer isn't being reset properly in stopAndIgnore which creates a single trace even when multiple traces are subsequently started and stopped.

#[AsCommand('app:profiler-test')]
class ProfilerTestCommand extends Command
{
    public function __construct(private ProfilerInterface $profiler)
    {
        parent::__construct();
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $this->profiler->stopAndIgnore();

        for ($i = 0; $i < 5; $i++) {
            $this->profiler->start('test');
            $output->writeln((string) $i);
            usleep(50000);
            $this->profiler->stop();
        }
        return Command::SUCCESS;
    }
}

There are no traces on master. In the screenshot you can see 2 requests since I ran the command twice, but no spans were created.

There are 4 traces using this branch:

[magikid]

The test failures might be related to DataDog/dd-trace-php#944

[allenisalai]

DataDog/dd-trace-php#1533

Its not part of the interface. I'll see if they have a suggestion to match our use case.

[allenisalai]

ini_set("datadog.tracer.enabled", '0');
ini_set("datadog.tracer.enabled", '1');

Doesn't work. For now I'm going to remove the stopAndIgnore changes from the PR since there's no clear resolution yet.

[allenisalai]

Keeping GlobalTracer::set(new Tracer()) worked in conjunction with disabling and reenabling dd tracer.