compareTo method
- MonitorId other
override
    Compares this object to another object.
Returns a value like a Comparator when comparing this to other.
That is, it returns a negative integer if this is ordered before other,
a positive integer if this is ordered after other,
and zero if this and other are ordered together.
The other argument must be a value that is comparable to this object.
Implementation
@override
int compareTo(MonitorId other) {
  // Negative return value means `this` will be appear first.
  final cmp = name.compareTo(other.name);
  if (cmp == 0) {
    return disambiguator - other.disambiguator;
  }
  return cmp;
}