1 files changed, 64 insertions, 0 deletions
diff --git a/src/Metrics/MetricsInterface.php b/src/Metrics/MetricsInterface.php
new file mode 100644
index 00000000..ec2009b0
--- /dev/null
+++ b/src/Metrics/MetricsInterface.php
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * Spiral Framework.
+ *
+ * @license   MIT
+ * @author    Anton Titov (Wolfy-J)
+ */
+declare(strict_types=1);
+
+namespace Spiral\RoadRunner;
+
+use Spiral\RoadRunner\Exception\MetricException;
+
+interface MetricsInterface
+{
+    /**
+     * Add collector value. Fallback to appropriate method of related collector.
+     *
+     * @param string  $collector
+     * @param float   $value
+     * @param mixed[] $labels
+     *
+     * @throws MetricException
+     * @return void
+     */
+    public function add(string $collector, float $value, array $labels = []);
+
+    /**
+     * Subtract the collector value, only for gauge collector.
+     *
+     * @param string  $collector
+     * @param float   $value
+     * @param mixed[] $labels
+     *
+     * @throws MetricException
+     * @return void
+     */
+    public function sub(string $collector, float $value, array $labels = []);
+
+    /**
+     * Observe collector value, only for histogram and summary collectors.
+     *
+     * @param string  $collector
+     * @param float   $value
+     * @param mixed[] $labels
+     *
+     * @throws MetricException
+     * @return void
+     */
+    public function observe(string $collector, float $value, array $labels = []);
+
+    /**
+     * Set collector value, only for gauge collector.
+     *
+     * @param string  $collector
+     * @param float   $value
+     * @param mixed[] $labels
+     *
+     * @throws MetricException
+     * @return void
+     */
+    public function set(string $collector, float $value, array $labels = []);
+}