Device Checks & Alert Settings

We can add checks and define alert settings directly from the device page.

To add a check, you just need to select an available check type as shown below:

The following example shows how to use the OPENWISP_MONITORING_METRICS setting to reconfigure the system for iperf3 check to send an alert if the measured TCP bandwidth has been less than 10Mbit/s for more than 2 days.

1. By default, Iperf3 checks come with default alert settings, but it is easy to customize alert settings through the device page as shown below:

2. Now, add the following notification configuration to send an alert for TCP bandwidth:

# Main project settings.py
from django.utils.translation import gettext_lazy as _

OPENWISP_MONITORING_METRICS = {
    "iperf3": {
        "notification": {
            "problem": {
                "verbose_name": "Iperf3 PROBLEM",
                "verb": _("Iperf3 bandwidth is less than normal value"),
                "level": "warning",
                "email_subject": _(
                    "[{site.name}] PROBLEM: {notification.target} {notification.verb}"
                ),
                "message": _(
                    "The device [{notification.target}]({notification.target_link}) "
                    "{notification.verb}."
                ),
            },
            "recovery": {
                "verbose_name": "Iperf3 RECOVERY",
                "verb": _("Iperf3 bandwidth now back to normal"),
                "level": "info",
                "email_subject": _(
                    "[{site.name}] RECOVERY: {notification.target} {notification.verb}"
                ),
                "message": _(
                    "The device [{notification.target}]({notification.target_link}) "
                    "{notification.verb}."
                ),
            },
        },
    },
}
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Note

To access the features described above, the user must have permissions for Check and AlertSetting inlines, these permissions are included by default in the "Administrator" and "Operator" groups and are shown in the screenshot below.

How is Historical Data Handled?

The OpenWrt Monitoring Agent collects and temporarily stores monitoring data locally on the device when it cannot reach OpenWISP, for example, during network or server outages.

OpenWISP Monitoring supports the submission of historical data, meaning monitoring information that could not be delivered in real time and is sent at a later stage. This capability makes both the agent and the server resilient to occasional disruptions.

However, it's important to note that historical data does not trigger alerts or affect the health status of a device. Threshold checks and health evaluations are only applied to fresh data. This approach prevents conflicts between outdated information and the device's current state, which may have changed significantly.