Rope- or spot-style leak sensors report a binary or short-cable-length state over SNMP, and are worth alerting on immediately rather than waiting for a scheduled poll.
Leak sensors are one of the clearer cases for enabling SNMP traps rather than relying solely on polling: a leak under a raised floor is exactly the kind of event you want reported the instant it's detected, not up to a minute later.
Unlike a temperature threshold, there's rarely a legitimate reason for this alert to be anything less than critical; configure it that way rather than leaving it at whatever severity the device's default detection profile assigns.
Many rope-style sensors have a manufacturer-documented safe way to trigger a test condition; do this once after setup to confirm the full path (sensor to Linivo to your on-call notification) actually works, not just that the device shows connected.