initial draft prepared

elastic · Oct 22, 2024 · 987d1e8 · 987d1e8
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diff --git a/docs/en/observability/slo-create.asciidoc b/docs/en/observability/slo-create.asciidoc
@@ -18,6 +18,12 @@ From here, complete the following steps:
 . <<set-slo>>.
 . <<slo-describe>>.
 
+[NOTE]
+====
+For SLOs to function, the cluster must include one or more nodes with both `ingest` and `transform` {ref}/modules-node.html#node-roles[roles] (they can co-exist or be distributed across separate nodes).
+On ESS deployments (Elastic Cloud), this is handled by the hot nodes, which serve as both `ingest` and `transform` nodes.
+====
+
 [discrete]
 [[define-sli]]
 = Define your SLI