Fix missing alt text in images

docs/sources/alerting/fundamentals/alert-rule-evaluation/_index.md

@@ -29,7 +29,7 @@ The criteria determining when an alert rule fires are based on two settings:
 - [Evaluation group](#evaluation-group): how frequently the alert rule is evaluated.
 - [Pending period](#pending-period): how long the condition must be met to start firing.
 
-{{< figure src="/media/docs/alerting/alert-rule-evaluation.png" max-width="750px" caption="Set alert rule evaluation" >}}
+{{< figure src="/media/docs/alerting/alert-rule-evaluation.png" max-width="750px" alt="Set the evaluation behavior of the alert rule in Grafana." caption="Set alert rule evaluation" >}}
 
 ## Evaluation group
 
@@ -57,7 +57,7 @@ Keep in mind:
 - Alert instances from the same alert rule may be in different states. For instance, only one observed machine might start firing.
 - Only **Alerting** and **Resolved** alert instances are routed to manage their notifications.
 
-{{< figure src="/media/docs/alerting/alert-rule-evaluation-overview-statediagram-v2.png" max-width="750px" >}}
+{{< figure src="/media/docs/alerting/alert-rule-evaluation-overview-statediagram-v2.png" alt="A diagram of the alert instance states and when to route their notifications."  max-width="750px" >}}
 
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docs/sources/alerting/fundamentals/alert-rule-evaluation/state-and-health.md

@@ -52,13 +52,13 @@ An alert instance can be in either of the following states:
 | **NoData**   | The state of an alert whose query returns no data or all values are null. You can [change the default behavior.](/docs/grafana/latest/alerting/alerting-rules/create-grafana-managed-rule/#configure-no-data-and-error-handling)          |
 | **Error**    | The state of an alert when an error or timeout occurred evaluating the alert rule. You can [change the default behavior.](/docs/grafana/latest/alerting/alerting-rules/create-grafana-managed-rule/#configure-no-data-and-error-handling) |
 
-{{< figure src="/media/docs/alerting/alert-instance-states-v3.png" caption="Alert instance state diagram" alt="Alert instance state diagram" max-width="750px" >}}
+{{< figure src="/media/docs/alerting/alert-instance-states-v3.png" caption="Alert instance state diagram" alt="A diagram of the distinct alert instance states and transitions." max-width="750px" >}}
 
 ### Notifications
 
 Alert instances will be routed for [notifications](ref:notifications) when they are in the `Alerting` state or have been `Resolved`, transitioning from `Alerting` to `Normal` state.
 
-{{< figure src="/media/docs/alerting/alert-rule-evaluation-overview-statediagram-v2.png" max-width="750px" >}}
+{{< figure src="/media/docs/alerting/alert-rule-evaluation-overview-statediagram-v2.png" alt="A diagram of the alert instance states and when to route their notifications." max-width="750px" >}}
 
 ### Lifecycle of stale alert instances
 
@@ -72,7 +72,7 @@ The "Keep Last State" option helps mitigate temporary data source issues, preven
 
 In [Configure no data and error handling,](ref:no-data-and-error-handling) you can decide to keep the last state of the alert instance when a `NoData` and/or `Error` state is encountered. Just like normal evaluation, the alert instance transitions from `Pending` to `Alerting` after the pending period has elapsed.
 
-{{< figure src="/media/docs/alerting/alert-rule-configure-no-data-and-error.png" max-width="500px" >}}
+{{< figure src="/media/docs/alerting/alert-rule-configure-no-data-and-error.png" alt="A screenshot of the `Configure no data and error handling` option in Grafana Alerting." max-width="500px" >}}
 
 However, in situations where strict monitoring is critical, relying solely on the "Keep Last State" option may not be appropriate. Instead, consider using an alternative or implementing additional alert rules to ensure that issues with prolonged data source disruptions are detected.