private void setSeverityHoverTip(final Severity severity) {
        final String namePart = pipelineElement.getType()
                + " '" + pipelineElement.getId() + "'";
        if (severity == null) {
            getElement().setTitle(namePart);
        } else {
            String severityPart = severity.getSummaryValue().toLowerCase();
            if (Severity.INFO.equals(severity)) {
                severityPart += " messages";
            }
            getElement().setTitle(namePart + " has " + severityPart);
        }
    }
Set the severity for this pipe element or null if there isn't one.
Not all severities are rendered.
stroom-core-client/src/main/java/stroom/pipeline/structure/client/view/PipelineElementBox.java