Cherry pick PR #3340: Add slot selection status to loader app metrics #319

Job	Run time
xb1 / initialize	47s
xb1 / build-docker-image	2m 18s
xb1 / xb1_devel	43m 10s
xb1 / xb1_debug	46m 12s
xb1 / xb1_qa	38m 1s
xb1 / xb1_gold	36m 49s
xb1 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
	2h 47m 17s

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