'They monitor it, so I don't need my own' — blind spots

'They monitor it, so I don't need my own' — blind spots
Heard this week: a SaaS saw its host's dashboard all green while real users 500'd. Word is host monitoring watches the infra — node health, server response — not your application's user journeys or third-party calls. A source who's sat both sides tells us providers rarely alert on a slow checkout or a failing payment webhook because those live above their line. The advice to 'trust the host's monitoring' confuses infra heartbeat with experience monitoring.
Watch this: when a host's status page is green during your outage, you've found the boundary of what 'managed' covers.