The "Time.at(t.to_f).strftime" assumes that t is a LogStash::Timestamp. You need to use a date filter to parse date (and overwrite it) then the ruby filter should work.
The "Time.at(t.to_f).strftime" assumes that t is a LogStash::Timestamp. You need to use a date filter to parse date (and overwrite it) then the ruby filter should work.
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