Stats

This class provides static functions to give you access to the most common Stats actions.

It's typically used to start the desired Stats exporter and get access to Stats recording, Tag management and View registration.

Example:

use OpenCensus\Core\DaemonClient;
use OpenCensus\Trace\Tracer;
use OpenCensus\Tags\TagKey;
use OpenCensus\Tags\TagValue;
use OpenCensus\Tags\TagContext;
use OpenCensus\Stats\Stats;
use OpenCensus\Stats\Measure;
use OpenCensus\Stats\View\View;
use OpenCensus\Stats\View\Aggregation;

try {
    $daemon = DaemonClient::init(array("socketPath" => "/tmp/ocdaemon.sock"));
    Tracer::start($daemon);
    Stats::setExporter($daemon);
    $daemon->setReportingPeriod(2.0);
} catch (\Exception $e) {
    // Unable to set Stats Exporter, proceeding as Noop
}

$frontendKey = TagKey::create("example.com/keys/frontend");

$videoSize = Measure::newIntMeasure("example.com/measure/video_size", "size of processed videos", Measure::BYTES);

Stats::registerView(new View(
    "example.com/views/video_size",
    "processed video size over time",
    $videoSize,
    Aggregation::distribution([0, 1<<16, 1<<32]),
    $frontendKey
));

Tracer::inSpan(['name' => 'example.com/ProcessVideo'], function () use ($frontendKey, $videoSize) {
    // process video
    $tagCtx = TagContext::fromContext();
    $tagCtx->insert($frontendKey, TagValue::create("mobile-ios9.3.5"));
    sleep(1);
    Stats::newMeasurementMap()
        ->put($videoSize->M(25648))
        ->record();
});