Table 2. Plugin Return Codes
| Numeric Value | Service Status | Status Description |
|---|---|---|
| 0 | OK | The plugin was able to check the service and it appeared to be functioning properly |
| 1 | Warning | The plugin was able to check the service, but it appeared to be above some “warning” threshold or did not appear to be working properly |
| 2 | Critical | The plugin detected that either the service was not running or it was above some “critical” threshold |
| 3 | Unknown | Invalid command line arguments were supplied to the plugin or low-level failures internal to the plugin (such as unable to fork, or open a tcp socket) that prevent it from performing the specified operation. Higher-level errors (such as name resolution errors, socket timeouts, etc) are outside of the control of plugins and should generally NOT be reported as UNKNOWN states. |
link: http://nagiosplug.sourceforge.net/developer-guidelines.html#AEN35
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