private void addFooter(final StringBuilder contentBuilder, final long stableStateTimePeriode) {
            contentBuilder.append("<font size=\"-1\">\n")
                    .append("1) FC - Failed connections - We have tried to connect to the nodes this many times " +
                            "without being able to contact it.<br>\n")
                    .append("2) OCT - Out of contact time - Time in seconds we have failed to contact the node.<br>\n")
                    .append("3) SPT - State pending time - Time the current getNodeState request has been " +
                            "pending.<br>\n")
                    .append("4) SSV - System state version - The latest system state version the node has " +
                            "acknowledged (last <em>activated</em> state version in parentheses if this is not equal to SSV).<br>\n")
                    .append("5) PC - Premature crashes - Number of times node has crashed since last time it had " +
                            "been stable in up or down state for more than "
                            + RealTimer.printDuration(stableStateTimePeriode) + ".<br>\n")
                    .append("6) ELW - Events last week - The number of events that has occured on this node the " +
                            "last week. (Or shorter period if a week haven't passed since restart or more than " +
                            "max events to keep in node event log have happened during last week.)<br>\n")
                    .append("</font>\n");
        }
Renders web page with cluster status.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/status/statuspage/VdsClusterHtmlRenderer.java