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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 */ namespace Wikimedia\Stats\Metrics; use Psr\Log\LoggerInterface; use Wikimedia\Stats\Sample; /** * Metric Interface * * @author Cole White * @since 1.41 */ interface MetricInterface { /** * @param BaseMetricInterface $baseMetric * @param LoggerInterface $logger */ public function __construct( BaseMetricInterface $baseMetric, LoggerInterface $logger ); /** @return string */ public function getName(): string; /** @return string */ public function getComponent(): string; /** @return float */ public function getSampleRate(): float; /** @return string */ public function getTypeIndicator(): string; /** * 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; /** * Sets sample rate on a new metric instance. * * @param float $sampleRate * @return self|NullMetric */ public function setSampleRate( float $sampleRate ); /** * Returns the list of defined label keys. * * @return string[] */ public function getLabelKeys(): array; /** * Adds a label $key with $value. * Note that the order in which labels are added is significant for StatsD output. * * Example: * ```php * $statsFactory->getCounter( 'testMetric_total' ) * ->setLabel( 'first', 'foo' ) * ->setLabel( 'second', 'bar' ) * ->increment(); * ``` * statsd: "mediawiki.testMetric_total.foo.bar" * prometheus: "mediawiki_testMetric_total{ first='foo', second='bar' } * * @param string $key * @param string $value * @return self|NullMetric */ public function setLabel( string $key, string $value ); /** * Convenience function to set a number of labels at once. * @see ::setLabel * @param array<string,string> $labels * @return self|NullMetric */ public function setLabels( array $labels ); /** * Copies metric operation to StatsD at provided namespace. * * Takes a namespace or multiple namespaces. * * @param string|string[] $statsdNamespaces * @return self|NullMetric */ public function copyToStatsdAt( $statsdNamespaces ); /** * Returns metric with cleared labels. * * @return self|NullMetric */ public function fresh(); }
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