[Metrics SDK] Change Prometheus CMake target name (#1765)

Author: lalitb

examples/prometheus/CMakeLists.txt

@@ -2,4 +2,5 @@ include_directories(${CMAKE_SOURCE_DIR}/exporters/prometheus/include)
 add_executable(prometheus_example main.cc)
 target_link_libraries(
   prometheus_example ${CMAKE_THREAD_LIBS_INIT} opentelemetry_metrics
-  prometheus_exporter opentelemetry_resources common_metrics_foo_library)
+  opentelemetry_exporter_prometheus opentelemetry_resources
+  common_metrics_foo_library)

exporters/prometheus/CMakeLists.txt

@@ -17,23 +17,23 @@ if(NOT TARGET prometheus-cpp::core)
   find_package(prometheus-cpp CONFIG REQUIRED)
 endif()
 
-add_library(prometheus_exporter src/exporter.cc src/collector.cc
-                                src/exporter_utils.cc)
+add_library(opentelemetry_exporter_prometheus src/exporter.cc src/collector.cc
+                                              src/exporter_utils.cc)
 target_include_directories(
-  prometheus_exporter
+  opentelemetry_exporter_prometheus
   PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
          "$<INSTALL_INTERFACE:include>")
 
-set(PROMETHEUS_EXPORTER_TARGETS prometheus_exporter)
+set(PROMETHEUS_EXPORTER_TARGETS opentelemetry_exporter_prometheus)
 if(TARGET pull)
   list(APPEND PROMETHEUS_EXPORTER_TARGETS pull)
 endif()
 if(TARGET core)
   list(APPEND PROMETHEUS_EXPORTER_TARGETS core)
 endif()
 target_link_libraries(
-  prometheus_exporter PUBLIC opentelemetry_metrics prometheus-cpp::pull
-                             prometheus-cpp::core)
+  opentelemetry_exporter_prometheus
+  PUBLIC opentelemetry_metrics prometheus-cpp::pull prometheus-cpp::core)
 install(
   TARGETS ${PROMETHEUS_EXPORTER_TARGETS}
   EXPORT "${PROJECT_NAME}-target"

exporters/prometheus/test/CMakeLists.txt

@@ -2,7 +2,8 @@ foreach(testname exporter_test collector_test exporter_utils_test)
   add_executable(${testname} "${testname}.cc")
   target_link_libraries(
     ${testname} ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT}
-    prometheus_exporter prometheus-cpp::pull opentelemetry_resources)
+    opentelemetry_exporter_prometheus prometheus-cpp::pull
+    opentelemetry_resources)
   gtest_add_tests(
     TARGET ${testname}
     TEST_PREFIX exporter.