private String prettyDouble(Double d) {
        if (Double.isFinite(d) || d.isNaN()) return d.toString();
        return d.equals(Double.NEGATIVE_INFINITY) ? "-Inf" : "Inf";
    }
Produces a flat list of metric entries from a snapshot (which organizes metrics by dimensions)
container-core/src/main/java/com/yahoo/container/jdisc/state/StateHandler.java