Remove unused enum SensorMetric

Signed-off-by: Tiyash Basu <[email protected]>

# Conflicts:
#	proto/frequenz/api/common/v1/microgrid/sensors/sensors.proto

# Conflicts:
#	proto/frequenz/api/common/v1/microgrid/sensors/sensors.proto

Author: tiyash-basu-frequenz

RELEASE_NOTES.md

@@ -36,6 +36,7 @@
 - Renamed `sampled_at` timestamps for state snapshots to `origin_time`.
 - Renamed `sampled_at` timestamps for metric samples to `sample_time`.
 - Remove `SensorMetricSample` in favour of using `MetricSample` for sensors.
+- Remove `SensorMetric` enum, since it was unused and redundant.
 
 ## Bug Fixes
 

proto/frequenz/api/common/v1/microgrid/sensors/sensors.proto

@@ -42,46 +42,6 @@ enum SensorCategory {
   SENSOR_CATEGORY_GENERAL = 7;
 }
 
-// Enumrated sensor metrics.
-enum SensorMetric {
-  // Unspecified.
-  SENSOR_METRIC_UNSPECIFIED = 0;
-
-  // Temperature.
-  // In Celsius (°C).
-  SENSOR_METRIC_TEMPERATURE = 1;
-
-  // Humidity
-  // In percentage (%).
-  SENSOR_METRIC_HUMIDITY = 2;
-
-  // Pressure
-  // In Pascal (Pa).
-  SENSOR_METRIC_PRESSURE = 3;
-
-  // Irradiance / Radiation flux
-  // In watts per square meter (W / m^2).
-  SENSOR_METRIC_IRRADIANCE = 4;
-
-  // Velocity
-  // In meters per second (m / s).
-  SENSOR_METRIC_VELOCITY = 5;
-
-  // Acceleration.
-  // In meters per second per second (m / s^2)
-  SENSOR_METRIC_ACCELERATION = 6;
-
-  // Metric to represent angles, for metrics like direction.
-  // In angles with respect to the (magnetic) North (°).
-  SENSOR_METRIC_ANGLE = 7;
-
-  // Dew point.
-  // The temperature at which the air becomes saturated with water vapor.
-  //
-  // In Celsius (°C).
-  SENSOR_METRIC_DEW_POINT = 8;
-}
-
 // Enum to represent the various states that a sensor can be in.
 // This enum is unified across all sensor categories for consistency.
 enum SensorStateCode {
@@ -207,18 +167,6 @@ message SensorStateSnapshot {
   repeated SensorDiagnostic errors = 4;
 }
 
-// Representation of a sampled sensor metric along with its value.
-message SensorMetricSample {
-  // The UTC timestamp of when the metric was sampled.
-  google.protobuf.Timestamp sample_time = 1;
-
-  // The metric that was sampled.
-  frequenz.api.common.v1.metrics.Metric metric = 2;
-
-  // The value of the sampled metric.
-  frequenz.api.common.v1.metrics.MetricValueVariant value = 3;
-}
-
 // SensorData message aggregates multiple metrics, operational states, and
 // errors, related to a specific microgrid sensor.
 //