Annotation Query Format
An annotation is an event that is overlayed on top of graphs. The query can have up to four columns per row, the time_sec column is mandatory. Annotation rendering is expensive so it is important to limit the number of rows returned.

- column with alias: time_sec for the annotation event. Format is UTC in seconds, use the below to convert a datetime column to UTC unix time stamp:
	DATEDIFF(second, {d '1970-01-01'}, DATEADD(second, DATEDIFF(second,GETDATE(),GETUTCDATE()), column_name) )
- column with alias: text for the annotation text
- column with alias: tags for annotation tags. This is a comma separated string of tags e.g. 'tag1,tag2'


Macros:
- $__time(column) -> DATEDIFF(second, {d '1970-01-01'}, DATEADD(second, DATEDIFF(second,GETDATE(),GETUTCDATE()), column) ) as time_sec
- $__timeFilter(column) ->  column > DATEADD(s, 1492750877+DATEDIFF(second,GETUTCDATE(),GETDATE()), '1970-01-01') AND column < DATEADD(s, 1492750877+DATEDIFF(second,GETUTCDATE(),GETDATE()), '1970-01-01')
- $__unixEpochFilter(column) ->  column > 1492750877 AND column < 1492750877

Or build your own conditionals using these macros which just return the values:
- $__timeFrom() ->  DATEADD(second, 1492750877+DATEDIFF(second,GETUTCDATE(),GETDATE()), '1970-01-01')
- $__timeTo() ->  DATEADD(second, 1492750877+DATEDIFF(second,GETUTCDATE(),GETDATE()), '1970-01-01')
- $__unixEpochFrom() ->  1492750877
- $__unixEpochTo() ->  1492750877