Disable stats decimation as a 7.0.1 workaround for a memory leak in Prometheus

level=info ts=2021-07-15T10:18:46.826Z caller=compact.go:494 component=tsdb msg="write block" mint=1626307200000 maxt=1626328800000 ulid=01FAMTT0VNVMV2149RSNW0M4GW duration=821.47751ms

level=info ts=2021-07-15T10:18:47.407Z caller=compact.go:494 component=tsdb msg="write block" mint=1626328800000 maxt=1626336000000 ulid=01FAMTT1NAT3G7FPGE729R1PBR duration=580.965225ms

level=info ts=2021-07-15T10:18:47.416Z caller=db.go:1152 component=tsdb msg="Deleting obsolete block" block=01FAMTR51NKY7WPP56W2201MMV

level=info ts=2021-07-15T10:18:47.420Z caller=db.go:1152 component=tsdb msg="Deleting obsolete block" block=01FAMTR5VBSYVN4G5XEWFRXZPZ

level=info ts=2021-07-15T10:18:47.436Z caller=db.go:1152 component=tsdb msg="Deleting obsolete block" block=01FAMTR3GW7WWJGKNF37FDXK60

fatal error: runtime: out of memory

runtime stack:

runtime.throw(0x28d6767, 0x16)

    /home/couchbase/jenkins/workspace/cbdeps-platform-build/deps/go1.14.2/src/runtime/panic.go:1116 +0x72

runtime.sysMap(0xc6cc000000, 0x4000000, 0x45aa2d8)

    /home/couchbase/jenkins/workspace/cbdeps-platform-build/deps/go1.14.2/src/runtime/mem_linux.go:169 +0xc5

runtime.(*mheap).sysAlloc(0x45954a0, 0x400000, 0x45954a8, 0xb9)

    /home/couchbase/jenkins/workspace/cbdeps-platform-build/deps/go1.14.2/src/runtime/malloc.go:715 +0x1cd

runtime.(*mheap).grow(0x45954a0, 0xb9, 0x0)

    /home/couchbase/jenkins/workspace/cbdeps-platform-build/deps/go1.14.2/src/runtime/mheap.go:1286 +0x11c

runtime.(*mheap).allocSpan(0x45954a0, 0xb9, 0xfc10100, 0x45aa2e8, 0xc004f6bf28)