Shopify store monitoring that understands the edge.

In August 2026, three Shopify storefronts monitored on PageLantern started failing their checks. The stores were fine — customers were browsing and buying the whole time. What actually happened: Shopify's edge had started rate-limiting our probe's egress IP, answering many checks with HTTP 429. Our scoring at the time did what most monitors still do — counted every refused request as a failed check — and for eight days those three storefronts recorded roughly 83% false downtime.

A 429 is the origin saying "I answered, and I decline to serve this particular request." That is evidence about the requester's traffic, not about whether the store is up. Scoring it as downtime is simply wrong, and at Shopify's scale — where the edge routinely throttles datacenter IPs that poll on a schedule — it is wrong constantly. We rebuilt our probe scoring around that incident, and the rebuilt behavior is now on every plan.

PageLantern now classifies three kinds of response as inconclusive: a rate-limit refusal (HTTP 429), a bot-protection block, and a bot-protection challenge page. An inconclusive response produces no verdict at all — it is not a failed check, it does not advance an incident, and it does not count against the store's uptime, because nothing about the store was measured.

The discards are bounded so a store that is genuinely down behind a throttle cannot go silently unwatched: after five consecutive inconclusive scheduled checks — about 25 minutes at the default 5-minute interval, far longer than Shopify's short-lived edge throttles need to clear — normal scoring resumes. And when a response carries a vendor's own block signature, proving the origin never saw the request, PageLantern instead opens a probe-blocked incident: a loud alert about our reach, not a false alarm about your uptime. The monitor shows "Not measured" for exactly what it is.

Shopify runs the platform, but plenty that customers depend on is still yours to watch — the domain you brought, the certificate on it, the theme's rendered pages, and the services your storefront calls.

Commerce storefronts are the most bot-defended pages on the internet. Between Shopify's own edge and fronting layers like Cloudflare, an external monitor's requests will sooner or later be throttled, challenged, or blocked — and any monitor that pretends otherwise will either invent downtime or report uptime it never measured. PageLantern recognizes vendor signatures for the major protection layers and scores their responses as inconclusive rather than guessing.

The operational states guide documents the whole model — what "Not measured" means, when a probe-blocked incident opens, and how to allowlist the probe by its User-Agent substring (PageLantern-Probe) rather than by IP, which breaks silently when egress addresses change.