Create an inventory rule

Based on the resources listed on the Inventory page within the Infrastructure app, you can create a threshold rule to notify you when a metric has reached or exceeded a value for a specific resource or a group of resources within your infrastructure.

Additionally, each rule can be defined using multiple conditions that combine metrics and thresholds to create precise notifications and reduce false positives.

Conditions for each rule can be applied to specific metrics relating to the inventory type you select. You can choose the aggregation type, the metric, and by including a warning threshold value, you can be alerted on multiple threshold values based on severity scores. When creating the rule, you can still get notified if no data is returned for the specific metric or if the rule fails to query Elasticsearch.

In this example, Kubernetes Pods is the selected inventory type. The conditions state that you will receive a critical alert for any pods within the ingress-nginx namespace with a memory usage of 95% or above and a warning alert if memory usage is 90% or above. The chart shows the results of applying the rule to the last 20 minutes of data. Note that the chart time range is 20 times the value of the look-back window specified in the FOR THE LAST field.

You can extend your rules with actions that interact with third-party systems, write to logs or indices, or send user notifications. You can add an action to a rule at any time. You can create rules without adding actions, and you can also define multiple actions for a single rule.

To add actions to rules, you must first create a connector for that service (for example, an email or external incident management system), which you can then use for different rules, each with their own action frequency.

Action frequency

After you select a connector, you must set the action frequency. You can choose to create a summary of alerts on each check interval or on a custom interval. For example, send email notifications that summarize the new, ongoing, and recovered alerts each hour:

Alternatively, you can set the action frequency such that you choose how often the action runs (for example, at each check interval, only when the alert status changes, or at a custom action interval). In this case, you define precisely when the alert is triggered by selecting a specific threshold condition: Alert, Warning, or Recovered (a value that was once above a threshold has now dropped below it).

You can also further refine the conditions under which actions run by specifying that actions only run when they match a KQL query or when an alert occurs within a specific time frame:

• If alert matches query: Enter a KQL query that defines field-value pairs or query conditions that must be met for notifications to send. The query only searches alert documents in the indices specified for the rule.
• If alert is generated during timeframe: Set timeframe details. Notifications are only sent if alerts are generated within the timeframe you define.

Action variables

Use the default notification message or customize it. You can add more context to the message by clicking the Add variable icon and selecting from a list of available variables.

The following variables are specific to this rule type. You can also specify variables common to all rules.

context.alertDetailsUrl

Link to the alert troubleshooting view for further context and details. This will be an empty string if the server.publicBaseUrl is not configured.

context.alertState

Current state of the alert.

context.cloud

The cloud object defined by ECS if available in the source.

context.container

The container object defined by ECS if available in the source.

context.group

Name of the group reporting data.

context.host

The host object defined by ECS if available in the source.

context.labels

List of labels associated with the entity where this alert triggered.

context.metric

The metric name in the specified condition. Usage: (ctx.metric.condition0, ctx.metric.condition1, and so on).

context.orchestrator

The orchestrator object defined by ECS if available in the source.

context.originalAlertState

The state of the alert before it recovered. This is only available in the recovery context.

context.originalAlertStateWasALERT

Boolean value of the state of the alert before it recovered. This can be used for template conditions. This is only available in the recovery context.

context.originalAlertStateWasWARNING

Boolean value of the state of the alert before it recovered. This can be used for template conditions. This is only available in the recovery context.

context.reason

A concise description of the reason for the alert.

context.tags

List of tags associated with the entity where this alert triggered.

context.threshold

The threshold value of the metric for the specified condition. Usage: (ctx.threshold.condition0, ctx.threshold.condition1, and so on)

context.timestamp

A timestamp of when the alert was detected.

context.value

The value of the metric in the specified condition. Usage: (ctx.value.condition0, ctx.value.condition1, and so on).

context.viewInAppUrl

Link to the alert source.

With infrastructure threshold rules, it’s not possible to set an explicit index pattern as part of the configuration. The index pattern is instead inferred from Metrics indices on the Settings page of the Infrastructure app.

With each execution of the rule check, the Metrics indices setting is checked, but it is not stored when the rule is created.