TRACING-4063: document cumulativetodeltaprocessor

Signed-off-by: Andreas Gerstmayr <[email protected]>

Author: andreasgerstmayr

modules/otel-collector-components.adoc

@@ -557,7 +557,40 @@ config: |
 <2> The default exporter when the attribute value is not present in the table in the next section.
 <3> The table that defines which values are to be routed to which exporters.
 
-You can optionally create an `attribute_source` configuratiion, which defines where to look for the attribute in `from_attribute`. The allowed value is `context` to search the context, which includes the HTTP headers, or `resource` to search the resource attributes.
+You can optionally create an `attribute_source` configuration, which defines where to look for the attribute in `from_attribute`. The allowed value is `context` to search the context, which includes the HTTP headers, or `resource` to search the resource attributes.
+
+[id="cumulativetodelta-processor_{context}"]
+=== Cumulative to Delta Processor
+
+This processor converts monotonic, cumulative-sum, and histogram metrics to monotonic delta metrics.
+
+You can filter metrics by using the `include:` or `exclude:` fields and specifying the `strict` or `regexp` metric name matching.
+
+This processor does not convert non-monotonic sums and exponential histograms.
+
+:FeatureName: The Cumulative to Delta Processor
+include::snippets/technology-preview.adoc[]
+
+.Example of an OpenTelemetry Collector custom resource with an enabled Cumulative to Delta Processor
+[source,yaml]
+----
+config: |
+  processors:
+    cumulativetodelta:
+      include: # <1>
+        match_type: strict # <2>
+        metrics: # <3>
+        - <metric_1_name>
+        - <metric_2_name>
+      exclude: # <4>
+        match_type: regexp
+        metrics:
+        - "<regular_expression_for_metric_names>"
+----
+<1> Optional: Configures which metrics to include. When omitted, all metrics, except for those listed in the `exclude` field, are converted to delta metrics.
+<2> Defines a value provided in the `metrics` field as a `strict` exact match or `regexp` regular expression.
+<3> Lists the metric names, which are exact matches or matches for regular expressions, of the metrics to be converted to delta metrics. If a metric matches both the `include` and `exclude` filters, the `exclude` filter takes precedence.
+<4> Optional: Configures which metrics to exclude. When omitted, no metrics are excluded from conversion to delta metrics.
 
 [id="exporters_{context}"]
 == Exporters