diff --git a/src/interfaces/metric.hpp b/src/interfaces/metric.hpp
index 5a960a4..deb3ed6 100644
--- a/src/interfaces/metric.hpp
+++ b/src/interfaces/metric.hpp
@@ -16,7 +16,7 @@
     virtual ~Metric() = default;
 
     virtual void initialize() = 0;
-    virtual const std::vector<MetricValue>& getReadings() const = 0;
+    virtual const MetricValue& getReading() const = 0;
     virtual LabeledMetricParameters dumpConfiguration() const = 0;
 };
 
diff --git a/src/interfaces/types.hpp b/src/interfaces/types.hpp
index 3cc069e..a5ed0db 100644
--- a/src/interfaces/types.hpp
+++ b/src/interfaces/types.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "operation_type.hpp"
 #include "utils/labeled_tuple.hpp"
 #include "utils/tstring.hpp"
 
@@ -11,17 +12,17 @@
 #include <vector>
 
 using ReadingParameters =
-    std::vector<std::tuple<std::vector<sdbusplus::message::object_path>,
-                           std::string, std::string, std::string>>;
+    std::vector<std::tuple<sdbusplus::message::object_path, std::string,
+                           std::string, std::string>>;
 
 using LabeledSensorParameters =
     utils::LabeledTuple<std::tuple<std::string, std::string>,
                         utils::tstring::Service, utils::tstring::Path>;
 
 using LabeledMetricParameters =
-    utils::LabeledTuple<std::tuple<std::vector<LabeledSensorParameters>,
-                                   std::string, std::string, std::string>,
-                        utils::tstring::SensorPaths,
+    utils::LabeledTuple<std::tuple<LabeledSensorParameters, OperationType,
+                                   std::string, std::string>,
+                        utils::tstring::SensorPath,
                         utils::tstring::OperationType, utils::tstring::Id,
                         utils::tstring::MetricMetadata>;