Every place we check from.
Live status of our seven Cloudflare edge regions plus out-of-band sentinel nodes on independent ASNs (Hetzner AS24940). Updated continuously. Multi-ASN quorum verification guarantees that a single-cloud provider outage never triggers false customer alerts.
Allowlist our probes
Our synthetic probes originate from Cloudflare Durable Objects. Because serverless edge runtimes egress via Cloudflare's shared global edge IP pool, IP allowlisting is neither deterministic nor secure. Instead, configure your WAF or reverse proxy to match on our cryptographic CF-Worker: pulseguard.io header and verified User-Agent.
# 1. Cloudflare WAF Custom Rule (Recommended) # Our synthetic probes run as Cloudflare Durable Objects. # Subrequests include an authentic, un-spoofable CF-Worker header. # # Match Expression: (http.request.headers["cf-worker"][0] eq "pulseguard.io") # Action: Skip / Bypass WAF & Rate Limiting # 2. General WAF & Reverse Proxy Headers (Fastly / AWS WAF / Nginx) CF-Worker: pulseguard.io User-Agent: PulseGuard-Synthetic-Monitor/2.0 (+https://pulseguard.io/bot)
Coverage we don't have
South America, Africa, the Middle East, Oceania. Our probe regions run on Cloudflare's network, which does not currently place workloads in those regions — so we don't claim them.
What this means practically: a genuine outage still pages you, because your endpoint will fail from all seven regions regardless of where it's hosted. What we'd miss is a problem affecting only users in those regions — a São Paulo CDN edge, an African transit route. If that's a real risk for your traffic, tell us; it moves our roadmap, and we'll say so here when it ships.
When a probe goes bad, we say so
A monitoring probe with a bad network path reports failures that aren't real — the industry's most common source of false alarms. Any probe with three or more state transitions in two hours is marked Flapping and automatically removed from quorum until it stabilises.
Every probe also reports on a heartbeat channel separate from its measurement path, so a probe that's blocked is distinguishable from one that's crashed. All of it is visible above, in real time, including when it's our fault.