diff --git a/src/metric.hpp b/src/metric.hpp
new file mode 100644
index 0000000..a676e25
--- /dev/null
+++ b/src/metric.hpp
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "interfaces/metric.hpp"
+#include "interfaces/sensor_listener.hpp"
+
+class Metric : public interfaces::Metric, public interfaces::SensorListener
+{
+  public:
+    const std::vector<MetricValue>& getReadings() const override
+    {
+        return readings;
+    }
+
+    void sensorUpdated(interfaces::Sensor&, uint64_t) override
+    {}
+
+    void sensorUpdated(interfaces::Sensor&, uint64_t, double value) override
+    {}
+
+  private:
+    std::vector<MetricValue> readings;
+};