lib: cmetrics: test cat fixes #10089

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	13m 41s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 30s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	13m 2s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	13m 3s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	13m 7s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 57s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	13m 11s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	12m 58s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	13m 16s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	13m 10s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	46m 9s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 52s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	13m 5s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 56s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 56s
run-qemu-ubuntu-unit-tests (s390x)	22m 32s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 32s
run-aarch64-unit-tests (Aarch64 actuated testing, -DFLB_WITHOUT_flb-it-network=1 -DFLB_WITHOUT_fl...	3m 10s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	12m 47s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	13m 36s
Unit tests (matrix)	1s
	4h 55m 31s

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