QFE: fixing stats middleware when cache is enabled #15822

Job	Run time
Go build with -tags=stringlabels	39s
Go build with -tags=stringlabels	39s
Check misspelled words	11s
Check misspelled words	11s
Thanos end-to-end tests (8, 0)	5m 4s
Thanos end-to-end tests (8, 0)	5m 4s
Go build for different platforms	9m 32s
Go build for different platforms	9m 32s
Thanos end-to-end tests (8, 1)	3m 52s
Thanos end-to-end tests (8, 1)	3m 52s
Linters (Static Analysis) for Go	3m 2s
Linters (Static Analysis) for Go	3m 2s
Thanos unit tests	11m 48s
Thanos unit tests	11m 35s
Thanos end-to-end tests (8, 2)	3m 46s
Thanos end-to-end tests (8, 2)	3m 46s
Thanos end-to-end tests (8, 3)	4m 29s
Thanos end-to-end tests (8, 3)	4m 29s
Thanos end-to-end tests (8, 4)	7m 9s
Thanos end-to-end tests (8, 4)	8m 29s
Thanos end-to-end tests (8, 5)	4m 36s
Thanos end-to-end tests (8, 5)	4m 36s
Thanos end-to-end tests (8, 6)	4m 37s
Thanos end-to-end tests (8, 6)	4m 37s
Thanos end-to-end tests (8, 7)	4m 32s
Thanos end-to-end tests (8, 7)	4m 32s
	2h 7m 41s

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