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Where clause. Messages are processed only if they match all the key/value constraints. A valid constraint is of type key=value or key!=value. For each key a string (key:s) or a double (key:d) or a long (key:l) type can be specified. Default type is string.
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JSON output
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Order by. The output will be ordered according to the order by directive. Order by example: "step asc, centre desc" (step ascending and centre descending)
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