Port PR #4183 to serverless (#4204)

Author: dedemorton

docs/en/serverless/images/turn-on-system-metrics.png

@@ -0,0 +1,47 @@
+---
+slug: /serverless/observability/handle-no-results-found-message
+title: Understanding "no results found" message
+description: Learn about the reasons for "no results found" messages and how to fix them.
+tags: [ 'serverless', 'observability', 'how to' ]
+---
+
+<p><DocBadge template="technical preview" /></p>
+
+To correctly render visualizations in the ((observability)) UI,
+all metrics used by the UI must be present in the collected data.
+For a description of these metrics,
+refer to <DocLink slug="/serverless/observability/metrics-reference"/>.
+
+There are several reasons why metrics might be missing from the collected data:
+
+**The visualization requires a metric that's not relevant to your monitored hosts**
+
+For example, if you're only observing Windows hosts, the 'load' metric is not collected because 'load' is not a Windows concept.
+In this situation, you can ignore the "no results found" message.
+
+**You may not be collecting all the required metrics**
+
+This could be for any of these reasons:
+
+* The integration that collects the missing metrics is not installed.
+For example, to collect metrics from your host system, you can use the [System integration](((integrations-docs))/system).
+To fix the problem, install the integration and configure it to send the missing metrics.
+
+    <DocCallOut title="Tip">
+        Follow one of our quickstarts under **Observability** → **Add data** → **Collect and analyze logs** to make sure the correct integrations are installed and all required metrics are collected.
+    </DocCallOut>
+
+* You are not using the Elastic Distribution of the OpenTelemetry Collector, which automatically maps data to the Elastic Common Schema (ECS) fields expected by the visualization.
+
+    <DocCallOut title="Tip">
+        Follow our OpenTelemetry quickstart under **Observability** → **Add data** → **Monitor infrastructure** to make sure OpenTelemetry data is correctly mapped to ECS-compliant fields.
+    </DocCallOut>
+
+{/* TODO: Make quickstart an active link after the docs are merged. */}
+
+* You have explicitly chosen not to send these metrics.
+You may choose to limit the metrics sent to Elastic to save on space and improve cluster performance.
+For example, the System integration has options to choose which metrics you want to send.
+You can [edit the integration policy](((fleet-guide))/edit-or-delete-integration-policy.html) to begin collecting the missing metrics. For example:
+
+    ![Screenshot showing system cpu and diskio metrics selected for collection](../images/turn-on-system-metrics.png)

docs/en/serverless/infra-monitoring/handle-no-results-found-message.mdx

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+---
+slug: /serverless/observability/troubleshooting-infrastructure-monitoring
+title: Troubleshooting
+description: Learn how to troubleshoot issues with infrastructure monitoring.
+tags: [ 'serverless', 'observability', 'how to' ]
+---
+
+<p><DocBadge template="technical preview" /></p>
+
+Learn how to troubleshoot common issues on your own or ask for help.
+
+* <DocLink slug="/serverless/observability/handle-no-results-found-message" />
+
+## Elastic Support
+
+We offer a support experience unlike any other.
+Our team of professionals 'speak human and code' and love making your day.
+[Learn more about subscriptions](https://www.elastic.co/subscriptions).
+
+## Discussion forum
+
+For other questions and feature requests,
+visit our [discussion forum](https://discuss.elastic.co/c/observability).

docs/en/serverless/infra-monitoring/troubleshooting-infra.mdx

@@ -374,6 +374,14 @@
           "slug": "/serverless/observability/configure-intra-settings",
           "classic-sources": ["enObservabilityConfigureSettings"]
         },
+        {
+          "slug": "/serverless/observability/troubleshooting-infrastructure-monitoring",
+          "items": [
+            {
+              "slug": "/serverless/observability/handle-no-results-found-message"
+            }
+          ]
+        },
         {
           "slug": "/serverless/observability/metrics-reference",
           "classic-sources": ["enObservabilityMetricsReference"],