DNS Health Monitoring Without Hammering the API
Part of the PurelyManage series. The Naive Approach Breaks at Scale The first version of the Domains page rechecked every domain on every page load. The logic was simple: call updateDomainSettings with recheckDns: true for each domain, then call listDomains to get the fresh DNS status. That is N+2 API calls per request where N is the number of domains. With the dashboard set to auto-refresh every 60 seconds: 50 domains × 52 API calls × 60 requests/hour = ~3,000 API calls/hour This is both wasteful and fragile. Most domains are healthy most of the time. Rechecking 50 domains every minute to confirm they are still green is unnecessary. And if PurelyMail ever introduces rate limits, this approach is the first to break. ...