function MeterProviderFactory::create

@todo https://github.com/open-telemetry/opentelemetry-specification/blob/main…

• "The exporter MUST configure the default aggregation on the basis of instrument kind using the OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION variable as described below if it is implemented."

File

vendor/open-telemetry/sdk/Metrics/MeterProviderFactory.php, line 32

Class

MeterProviderFactory

Namespace

OpenTelemetry\SDK\Metrics

Code

public function create(?ResourceInfo $resource = null) : MeterProviderInterface {
    if (Sdk::isDisabled()) {
        return new NoopMeterProvider();
    }
    $exporters = Configuration::getList(Variables::OTEL_METRICS_EXPORTER);
    
    //TODO "The SDK MAY accept a comma-separated list to enable setting multiple exporters"
    if (count($exporters) !== 1) {
        throw new InvalidArgumentException(sprintf('Configuration %s requires exactly 1 exporter', Variables::OTEL_METRICS_EXPORTER));
    }
    $exporterName = $exporters[0];
    try {
        $factory = Registry::metricExporterFactory($exporterName);
        $exporter = $factory->create();
    } catch (\Throwable $t) {
        self::logWarning(sprintf('Unable to create %s meter provider: %s', $exporterName, $t->getMessage()));
        $exporter = new NoopMetricExporter();
    }
    // @todo "The exporter MUST be paired with a periodic exporting MetricReader"
    $reader = new ExportingReader($exporter);
    $resource ??= ResourceInfoFactory::defaultResource();
    $exemplarFilter = $this->createExemplarFilter(Configuration::getEnum(Variables::OTEL_METRICS_EXEMPLAR_FILTER));
    return MeterProvider::builder()->setResource($resource)
        ->addReader($reader)
        ->setExemplarFilter($exemplarFilter)
        ->build();
}