Docs: Update CloudWatch and Stackdriver docs for 6.6 (#21679)

* Add info about meta data labels * Add part about auto period calculations in cloudwatch * Minor adjustments * Updates after feedback * Add more context * Clarify what a metadata label is
2020-01-27 08:35:48 +01:00
parent 18788727f4
commit 5166ffca33
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@@ -146,6 +146,12 @@ As an example, if you want to apply arithmetic operations on a metric, you can d

 Please note that in the case you use the expression field to reference another query, like `queryA * 2`, it will not be possible to create an alert rule based on that query.

+### Period
+
+A period is the length of time associated with a specific Amazon CloudWatch statistic. Periods are defined in numbers of seconds, and valid values for period are 1, 5, 10, 30, or any multiple of 60.
+
+If the period field is left blank or set to `auto`, then it calculates automatically based on the time range. The formula used is `time range in seconds / 2000`, and then it snaps to the next higher value in an array of predefined periods `[60, 300, 900, 3600, 21600, 86400]`. By clicking `Show Query Preview` in the query editor, you can see what period Grafana used.
+
 ### Deep linking from Grafana panels to the CloudWatch console

 > Only available in Grafana v6.5+.