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<?php /** * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * @file */ declare( strict_types=1 ); namespace Wikimedia\Stats\Metrics; use Wikimedia\Stats\IBufferingStatsdDataFactory; use Wikimedia\Stats\Sample; /** * Base Metric Interface * * Interface for defining a Base Metric. * * @author Cole White * @since 1.41 */ interface BaseMetricInterface { /** * @param string $component The component this metric will track. * @param string $name The Metric Name. */ public function __construct( string $component, string $name ); /** * Records a Metric Sample. * * @param Sample $sample * @return void */ public function addSample( Sample $sample ): void; /** * Returns the configured sample rate. * * @return float */ public function getSampleRate(): float; /** * Sets the sample rate. * * @param float $sampleRate */ public function setSampleRate( float $sampleRate ): void; /** * Returns subset of samples corresponding to sample rate setting. * * @return Sample[] */ public function getSamples(): array; /** * Returns a count of samples recorded by the metric. * * @return int */ public function getSampleCount(): int; /** * Returns the Metric Name * * @return string */ public function getName(): string; /** * Add a label with key => value. * Note that the order in which labels are added is significant for StatsD output. * * Example: * ```php * $statsFactory->withComponent( 'demo' ) * ->getCounter( 'testMetric_total' ) * ->setLabel( 'first', 'foo' ) * ->setLabel( 'second', 'bar' ) * ->setLabel( 'third', 'baz' ) * ->increment(); * ``` * statsd: "mediawiki.demo.testMetric_total.foo.bar.baz" * prometheus: "mediawiki_demo_testMetric_total{first='foo',second='bar',third='baz'} * * @param string $key * @param string $value * @return void */ public function addLabel( string $key, string $value ): void; /** * Returns array of label keys. * * @return string[] */ public function getLabelKeys(): array; /** * Returns an array of label values in the order of label keys. * * @return string[] */ public function getLabelValues(): array; /** * Returns the Metric Component * * @return string */ public function getComponent(): string; /** * Clears the working labels. * * @return void */ public function clearLabels(): void; /** * Gets StatsD Data Factory instance or null. */ public function getStatsdDataFactory(); /** * Validates and sets legacy StatsD namespaces. * * @param string|string[] $statsdNamespaces * @return void */ public function setStatsdNamespaces( $statsdNamespaces ): void; /** * Returns the configured legacy StatsD namespaces. * * @return string[] */ public function getStatsdNamespaces(): array; /** * StatsD Data Factory instance to copy metrics to. * * @param IBufferingStatsdDataFactory $statsdDataFactory * @return BaseMetricInterface */ public function withStatsdDataFactory( IBufferingStatsdDataFactory $statsdDataFactory ); }
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