feat: tier4_metric_msgs (#149)

* add tier4_metric_msgs

* change metricList to metricArray

* ci(pre-commit): autofix

* update comments.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tier4_metric_msgs/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.5)
+project(tier4_metric_msgs)
+
+find_package(ament_cmake_auto REQUIRED)
+find_package(builtin_interfaces REQUIRED)
+find_package(rosidl_default_generators REQUIRED)
+
+ament_auto_find_build_dependencies()
+
+rosidl_generate_interfaces(
+  ${PROJECT_NAME}
+  "msg/Metric.msg"
+  "msg/MetricArray.msg"
+  DEPENDENCIES builtin_interfaces
+)
+
+
+if(BUILD_TESTING)
+  find_package(ament_lint_auto REQUIRED)
+  ament_lint_auto_find_test_dependencies()
+endif()
+
+ament_auto_package()

tier4_metric_msgs/msg/Metric.msg

@@ -0,0 +1,9 @@
+# name of the metric
+string name
+
+# unit (or type) of the metric
+# you can leave it empty or assign any identifier to the unit, such as "milliseconds", "m/s", "IoU", "battery percentage", etc.
+string unit
+
+# value of the metric
+string value

tier4_metric_msgs/msg/MetricArray.msg

@@ -0,0 +1,5 @@
+# time stamp
+builtin_interfaces/Time stamp
+
+# metrics list
+Metric[] metric_array

tier4_metric_msgs/package.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="3">
+  <name>tier4_metric_msgs</name>
+  <version>0.1.0</version>
+  <description>The tier4_metric_msgs package</description>
+  <maintainer email="[email protected]">Temkei Kem</maintainer>
+  <license>Apache License 2.0</license>
+
+  <buildtool_depend>ament_cmake_auto</buildtool_depend>
+
+  <build_depend>rosidl_default_generators</build_depend>
+
+  <exec_depend>rosidl_default_runtime</exec_depend>
+
+  <depend>builtin_interfaces</depend>
+
+  <test_depend>ament_lint_auto</test_depend>
+  <test_depend>ament_lint_common</test_depend>
+
+  <member_of_group>rosidl_interface_packages</member_of_group>
+
+  <export>
+    <build_type>ament_cmake</build_type>
+  </export>
+</package>