Merge pull request #2351 from splunk/trangl-docs-6396-archived-metrics-charts

Add section on archived metrics to charts doc

Author: mbechtold-splunk

data-visualization/charts/chart-builder.rst

@@ -19,7 +19,7 @@ If you are editing an existing chart, you might want to start by configuring plo
 Specify a signal for a plot line
 =============================================================================
 
-A signal is the :term:`metric` or :ref:`histogram metric <histograms>` you want to plot on the chart, to which you might add filters and apply analytics. Plot lines, or plots, are the building blocks of charts. A chart has one or more plots, and each plot is composed of the :term:`metric time series<Metric time series>` or histogram metric represented by the signal and its properties and dimensions, any filters, and any analytics applied.
+A signal is the :term:`metric` or :ref:`histogram metric <histograms>` you want to plot on the chart, to which you might add filters and apply analytics. Plot lines, or plots, are the building blocks of charts. A chart has one or more plots, and each plot is composed of the :term:`metric time series<metric time series>` or histogram metric represented by the signal and its properties and dimensions, any filters, and any analytics applied.
 
 .. note:: Instead of a metric, you can also enter a :ref:`time series expression<expression>` to create a composite or derived metric, specify an :ref:`event<chart-events>` to be displayed on the chart, or :ref:`link a detector to a chart<link-detector-to-chart>` to display its alert status on the chart.
 
@@ -114,6 +114,17 @@ In this case, if you want to plot a metric as histogram, do the following steps
 
 For more information on histogram function and supported methods, see :new-page:`histogram() <https://dev.splunk.com/observability/docs/signalflow/functions/histogram_function>` in the SignalFlow reference documentation.
 
+.. _archived-metrics-charts:
+   
+Use archived metrics in charts
+--------------------------------------
+
+When you select an archived metric as a signal in your chart, the archived metric can't be plotted.
+
+To include an archived metric in a chart, route the archived metric to real-time or create exception rules to make it available. For more information, see the :ref:`mpm-rule-routing-exception` section.
+
+To learn more about MPM, see :ref:`metrics-pipeline-intro`.
+
 .. _filter-signal:
 
 Filter the signal

infrastructure/metrics-pipeline/metrics-pipeline-intro.rst

@@ -46,7 +46,7 @@ Use metric pipeline management to control your data volume
 
 For each metric you send to Splunk Observability Cloud, MPM can help you configure how to ingest, keep, and manage the metric's data volume and cardinality.
 
-For example,  you can decide to route your low-value metrics to archived metrics, a low-cost data tier, or even entirely drop them. Meanwhile, your high-value metrics continue to be routed to the real-time tier for alerting and monitoring. To learn more, see :ref:`mpm-rule-routing`.
+For example, you can decide to route your low-value metrics to archived metrics, a low-cost data tier, or even entirely drop them. Meanwhile, your high-value metrics continue to be routed to the real-time tier for alerting and monitoring. To learn more, see :ref:`mpm-rule-routing`.
 
 You can also convert a high-cardinality metric into a low-cardinality metric by aggregating away the dimensions that are not needed. To learn more, see :ref:`mpm-rule-routing-exception`.