@Override
    public String toString() {
        return "StatisticEvent [timeMs=" + timeMs + ", timeAgnosticStatisticEvent="
                + timeAgnosticStatisticEvent + "]";
    }
Convenience method for extracting the value of a tag in this statistic event

@param tagName The name of the tag to extract
@return The value of the named tag
stroom-statistics/stroom-statistics-impl-sql/src/main/java/stroom/statistics/impl/sql/StatisticEvent.java