Alarms

URL: /alarms

The alarms page lets you define rules that trigger email notifications when sensor data crosses a threshold or when a sensor stops sending data entirely.

Concepts

Term	Meaning
Alarm rule	A named condition that is evaluated on a schedule
Check interval	How often the rule is evaluated (1 min – 1 hour)
Trigger	The rule condition is met — a notification is sent
Resolve	The condition is no longer met — a resolve notification is sent
Recipient	A user who receives the email when the rule triggers

Rules are grouped by department in the overview table.

Rule types

Threshold

A threshold rule triggers when the most recent value of a metric satisfies an operator condition:

metric  <operator>  threshold

Supported operators: <, >, <=, >=, =

Example: trigger when temperature > 30

No data (silence)

A no-data rule triggers when no data has been received for an entity (or a specific metric on that entity) for longer than a configurable number of minutes.

This is useful for detecting sensor outages or connectivity problems.

Example: trigger when entity R1 has been silent for > 60 minutes

If no metric is specified, the rule checks whether the entity has sent any metric at all. If a specific metric is set, only that metric is monitored.

Creating a rule

1. Click Add rule.
2. Enter a descriptive name.
3. Select the department.
4. Select the entity (sensor).
5. Choose the operator:
   • For threshold rules: select <, >, <=, >=, or =, then enter the threshold value.
   • For no-data rules: select no data, then enter the silence timeout in minutes.
6. For threshold rules: select the metric.
7. Set the check interval.
8. Click Save.

After saving, click the people icon on the rule row to add recipients.

Managing rules

Action	Icon	Description
Edit	✏	Change rule parameters
Recipients	👤	Add or remove email recipients
History	🕐	View the last 50 triggered/resolved events
Delete	🗑	Delete the rule and all its events

Rules can be temporarily disabled with the toggle in the Enabled column without deleting them.

Notifications

When a rule triggers, all recipients receive an email with:

• The rule name
• The entity and metric
• The condition and value (threshold) or silence duration (no data)
• The timestamp of the last received value

A second email is sent when the condition resolves (value returns to normal, or data resumes).

Email delivery requires SMTP to be configured in Settings.

Permissions

Any user associated with a department (via department membership) can create and manage alarm rules for that department. Superadmins can manage rules for all departments.