MongoDB Connections and WiredTiger Cache Status

const s = db.serverStatus();
const wt = s.wiredTiger.cache;
({
  connections_current: s.connections.current,
  connections_available: s.connections.available,
  cache_max_gb: +(wt["maximum bytes configured"] / 1073741824).toFixed(2),
  cache_used_gb: +(wt["bytes currently in the cache"] / 1073741824).toFixed(2),
  cache_dirty_gb: +(wt["tracked dirty bytes in the cache"] / 1073741824).toFixed(2),
  pages_read_into_cache: wt["pages read into cache"],
  uptime_hours: +(s.uptime / 3600).toFixed(1)
});