Rename metric_sample.proto to metrics.proto (#338)

This change renames the `metric_sample.proto` file to `metrics.proto` to
better reflect its content. The file contains multiple metric-related
messages, including `SimpleMetricValue` and `MetricSample`, which are
used to represent metric values and samples, respectively. The new name
`metrics.proto` is more descriptive and aligns with the purpose of the
file.

Author: tiyash-basu-frequenz

RELEASE_NOTES.md

@@ -25,6 +25,7 @@
 - Remove unnecessary gap in numbering in the `ElectricalComponentCategory` enum.
 - Renumber variants in the `Metric` enum to remove unnecessary gaps.
 - Added a new enum `ElectricalComponentControlMode` to define control modes for electrical components.
+- Renamed `metric_sample.proto` to `metrics.proto` to better reflect its content.
 
 ## Bug Fixes
 

proto/frequenz/api/common/v1/metrics/metric_sample.proto renamed to proto/frequenz/api/common/v1/metrics/metrics.proto

@@ -11,7 +11,7 @@ syntax = "proto3";
 package frequenz.api.common.v1.microgrid.electrical_components;
 
 import "frequenz/api/common/v1/metrics/bounds.proto";
-import "frequenz/api/common/v1/metrics/metric_sample.proto";
+import "frequenz/api/common/v1/metrics/metrics.proto";
 import "frequenz/api/common/v1/microgrid/electrical_components/battery.proto";
 import
   "frequenz/api/common/v1/microgrid/electrical_components/ev_charger.proto";

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

@@ -10,7 +10,7 @@ syntax = "proto3";
 
 package frequenz.api.common.v1.microgrid.sensors;
 
-import "frequenz/api/common/v1/metrics/metric_sample.proto";
+import "frequenz/api/common/v1/metrics/metrics.proto";
 import "frequenz/api/common/v1/microgrid/lifetime.proto";
 
 import "google/protobuf/timestamp.proto";

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

@@ -38,17 +38,17 @@ def test_module_import_metrics_bounds() -> None:
     assert bounds_pb2_grpc is not None
 
 
-def test_module_import_metrics_metric_sample() -> None:
+def test_module_import_metrics_metrics() -> None:
     """Test that the modules can be imported."""
     # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1.metrics import metric_sample_pb2
+    from frequenz.api.common.v1.metrics import metrics_pb2
 
-    assert metric_sample_pb2 is not None
+    assert metrics_pb2 is not None
 
     # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1.metrics import metric_sample_pb2_grpc
+    from frequenz.api.common.v1.metrics import metrics_pb2_grpc
 
-    assert metric_sample_pb2_grpc is not None
+    assert metrics_pb2_grpc is not None
 
 
 def test_module_import_grid() -> None: