Synthetic Monitoring vs. Real User Monitoring: When to Use Each

"Monitoring" covers two genuinely different approaches, and it's worth being precise about which one you're getting from which tool.

Synthetic monitoring (what MonSPHERE does)

Synthetic monitors run scripted checks against your systems on a schedule — MonSPHERE's http, https, ping, tcp, dns, ssl, and heartbeat monitor types all fall into this category. They tell you whether an endpoint is reachable, how fast it responds, and whether a certificate is about to expire — from MonSPHERE's own checking infrastructure, not from inside a real user's browser.

curl -X POST https://api.monsphere.com/api/v1/monitors \
  -H "X-Api-Key: msk_live_..." \
  -d '{"name": "Checkout API", "type": "https", "target": "https://shop.example.com/api/checkout", "intervalSeconds": 30}'

The strength of synthetic monitoring is consistency — the same check runs the same way every interval, so a graph of response time over a month means something. The limitation is exactly that: it only tells you what the check experienced, not what your actual users experienced on their actual devices and networks.

Real User Monitoring (not something MonSPHERE offers today)

RUM captures telemetry from real user sessions in the browser — actual page load times, actual error rates, segmented by real geography and device. It's a genuinely different data collection model, and MonSPHERE doesn't implement it today. If you need browser-side RUM, you'd pair a dedicated RUM tool with MonSPHERE's synthetic and infrastructure monitoring rather than expect one platform to do both.

When each one matters

Synthetic monitoring is what tells you a service is down — often before a single real user has even hit the broken endpoint. RUM is what tells you a service is slow for a specific segment of real users even while every synthetic check is passing. They answer different questions, and most mature monitoring setups use both, from different tools.