dovecot 2.2.13

all, below command not reporting the actual usage report on dovecot 2.2.13. please share your suggestion to how to fix this issue

doveadm -f flow mailbox status -A -t 'messages vsize' '*' is just showing

rkreddy messages=0 vsize=0 jcplho messages=0 vsize=0 planning messages=0 vsize=0 accounts messages=0 vsize=0 spam.notify messages=0 vsize=0 jsraju messages=0 vsize=0 amarnath messages=0 vsize=0 kamesh messages=0 vsize=0 moulivarma messages=0 vsize=0 test messages=0 vsize=0 electrical messages=0 vsize=0 subbarao messages=0 vsize=0 contracts messages=0 vsize=0 rrsrinivas messages=0 vsize=0 sralluri messages=0 vsize=0 jvgkraju messages=0 vsize=0 harikrishna messages=0 vsize=0 kvvnrao messages=0 vsize=0 chandrasekhar messages=0 vsize=0 admin messages=0 vsize=0 gsnraju messages=0 vsize=0

Thanks Kumar

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