Ui interface less than is it any bug? (Druid)

i had v0.27.2 upgrade to v0.28.2

i saw console output like this:

INFO sync-metadata.fields :: Database type of Table 13 'web-im@performance' Field 'ttfb' has changed from '?' to 'LONG'.
INFO sync-metadata.fields :: Base type of Table 13 'web-im@performance' Field 'ttfb' has changed from ':type/Text' to ':type/Integer'.

my segment like this:

"dimensions" : [
    {
      "type": "long",
      "name": "ttfb"
    }
  ]
}

and when i get result from question, something go wrong

WARN druid.query-processor :: WARNING: Filtering only works on dimensions! 'ttfb' is a metric. Ignoring :> filter