cleanup(metrics): remove duplicated new_metric method #6376

Job	Run time
build-libs-linux-amd64-static 🎃	22m 48s
build-libs-emscripten 🧐	4m 35s
build-libs-others-amd64 😨 (windows-latest, MultiThreaded)	4m 20s
build-libs-linux-amd64 😁 (system_deps)	6m 21s
build-shared-libs-linux-amd64 🧐	4m 44s
build-libs-linux-amd64 😁 (bundled_deps)	18m 6s
build-shared-libs-macos-amd64 😨	1m 7s
build-libs-linux-amd64 😁 (system_deps_minimal)	5m 0s
build-libs-others-amd64 😨 (windows-latest, MultiThreadedDLL)	4m 46s
build-libs-linux-amd64 😁 (sanitizers)	14m 30s
build-libs-others-amd64 😨 (macos-latest)	2m 12s
run-e2e-tests-amd64 (system_deps)	9m 1s
build-libs-linux-arm64 😁 (system_deps)	6m 2s
run-e2e-tests-amd64 (bundled_deps)	20m 19s
test-libs-static (bundled_deps)	15m 9s
build-libs-linux-arm64 😁 (bundled_deps)	18m 44s
run-e2e-tests-amd64 (asan)	21m 52s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 53s
build-libs-linux-arm64 😁 (sanitizers)	17m 12s
	3h 21m 41s

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