# ICMP Monitor

- Import the `IcmpMonitor` construct from `checkly/constructs`.
- Reference [the docs for ICMP monitors](https://www.checklyhq.com/docs/constructs/icmp-monitor/) before generating any code.
- When adding `assertions`, always use `IcmpAssertionBuilder` class.
- Latency assertions require a property parameter: `'avg'`, `'min'`, `'max'`, or `'stdDev'`.
- Use `degradedPacketLossThreshold` and `maxPacketLossThreshold` for packet loss thresholds (percentages).
- **Plan-gated properties:** `retryStrategy`, `runParallel`, and higher frequencies are not available on all plans. Check entitlements matching `UPTIME_CHECKS_*` before using these. Omit any property whose entitlement is disabled. See `npx checkly skills manage` for details.

**Reference:** https://www.checklyhq.com/docs/constructs/icmp-monitor/

```typescript
import { AlertEscalationBuilder, Frequency, IcmpAssertionBuilder, IcmpMonitor, RetryStrategyBuilder } from 'checkly/constructs'

new IcmpMonitor('example-icmp-monitor', {
  name: 'Example ICMP Monitor',
  request: {
    hostname: 'INSERT_HOSTNAME',
    pingCount: 10,
    assertions: [
      IcmpAssertionBuilder.latency('avg').lessThan(100),
      IcmpAssertionBuilder.latency('max').lessThan(200),
    ],
  },
  degradedPacketLossThreshold: 10,
  maxPacketLossThreshold: 20,
  activated: true,
  locations: [
    'eu-central-1',
    'eu-north-1',
  ],
  frequency: Frequency.EVERY_10M,
  alertEscalationPolicy: AlertEscalationBuilder.runBasedEscalation(1, {
    amount: 0,
    interval: 5,
  }, {
    enabled: false,
    percentage: 10,
  }),
  retryStrategy: RetryStrategyBuilder.noRetries(),
})
```