MonitoringMonitoring types
ICMP Monitor
The ICMP Monitor checks whether a host is reachable on the network. This is ideal for infrastructure components that do not expose HTTP endpoints (e.g. routers, firewalls, VPN gateways, databases, or internal services).
How it works
- We send ICMP echo requests (“ping”) to your hostname.
- The monitor is considered healthy when the target responds within the configured timeout.
- We record latency and detect sustained reachability problems.
Configuration
Basic settings
- Name: A human-friendly label.
- Hostname: Hostname or IP address (no protocol, no path).
- Check interval: How often to check.
- Timeout: How long to wait for a response.
- Status:
active: checks run normally.maintenance: checks still run, but alerting may be dampened depending on alert logic.disabled: checks do not run.
Monitoring locations
ICMP checks run from our monitoring locations.
- If you set Allowed Check Countries on the monitor, checks run only from matching locations.
- If the monitor has no restrictions, (if configured) the customer-level allowed countries apply.
Page Size Check
The Page Size Check monitors the size of your website's HTML response content (body) in bytes. Unexpected changes in file size can indicate serious issues that are missed by a pure status code check (200 OK).
SMTP Monitor
The SMTP Monitor verifies that your SMTP server is reachable and responsive. This helps you detect outages of outbound mail gateways and mail delivery infrastructure before users report missing emails.