Hmm. Yes, you get
[2019-02-03T12:57:48,842][INFO ][filewatch.observingtail ] START, creating Discoverer, Watch with file and sincedb collections
but do not get a subsequent get chunk message. Can you re-run with trace level instead of debug? Here is what I would expect
[2019-02-03T08:58:37,963][TRACE][filewatch.sincedbcollection] open: reading from /dev/null
[2019-02-03T08:58:37,981][TRACE][filewatch.sincedbcollection] open: count of keys read: 0
[2019-02-03T08:58:38,036][TRACE][filewatch.discoverer ] discover_files {"count"=>1}
[2019-02-03T08:58:38,235][TRACE][filewatch.discoverer ] discover_files handling: {"new discovery"=>true, "watched_file details"=>"<FileWatch::WatchedFile: @filename='foo.txt', @state='watched', @recent_states='[:watched]', @bytes_read='0', @bytes_unread='0', current_size='804', last_stat_size='804', file_open?='false', @initial=true, @sincedb_key='53822 0 51714'>"}
[2019-02-03T08:58:38,290][TRACE][filewatch.sincedbcollection] associate: finding {"inode"=>"53822", "path"=>"/home/ec2-user/t.test/foo.txt"}
[2019-02-03T08:58:38,294][TRACE][filewatch.sincedbcollection] associate: unmatched
[2019-02-03T08:58:38,508][TRACE][filewatch.tailmode.processor] Delayed Delete processing
[2019-02-03T08:58:38,514][TRACE][filewatch.tailmode.processor] Watched + Active restat processing
[2019-02-03T08:58:38,584][TRACE][filewatch.tailmode.processor] Rotation In Progress processing
[2019-02-03T08:58:38,614][TRACE][filewatch.tailmode.processor] Watched processing
[2019-02-03T08:58:38,635][TRACE][filewatch.tailmode.handlers.createinitial] handling: foo.txt
[2019-02-03T08:58:38,657][TRACE][filewatch.tailmode.handlers.createinitial] opening foo.txt
[2019-02-03T08:58:38,681][TRACE][filewatch.tailmode.handlers.createinitial] handle_specifically opened file handle: 78, path: foo.txt
[2019-02-03T08:58:38,746][TRACE][filewatch.tailmode.handlers.createinitial] add_new_value_sincedb_collection {"position"=>0, "watched_file details"=>"<FileWatch::WatchedFile: @filename='foo.txt', @state='active', @recent_states='[:watched, :watched]', @bytes_read='0', @bytes_unread='804', current_size='804', last_stat_size='804', file_open?='true', @initial=true, @sincedb_key='53822 0 51714'>"}
[2019-02-03T08:58:38,775][TRACE][filewatch.tailmode.processor] Active - file grew: foo.txt: new size is 804, bytes read 0
[2019-02-03T08:58:38,778][TRACE][filewatch.tailmode.handlers.grow] handling: foo.txt
[2019-02-03T08:58:38,871][TRACE][filewatch.tailmode.handlers.grow] reading... {"iterations"=>1, "amount"=>804, "filename"=>"foo.txt"}
[2019-02-03T08:58:38,873][DEBUG][filewatch.tailmode.handlers.grow] read_to_eof: get chunk