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website: Adding a note around data-sources and depends_on for 0.12 users (#26222) 

* Adding not about data-sources and depends-on for 0.12 users

* Bold

* A little more markdown

* A little more markdown for data_sources in 0.12

* Some iteration based on good feedback
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Petros Kolyvas 2020-09-11 15:16:05 -03:00 committed by GitHub
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website/docs/configuration/data-sources.html.md
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@ -117,6 +117,9 @@ Data resources have the same dependency resolution behavior
Setting the `depends_on` meta-argument within `data` blocks defers reading of
the data source until after all changes to the dependencies have been applied.
~> **NOTE:** **In Terraform 0.12 and earlier**, due to the data resource behavior of deferring the read until the apply phase when depending on values that are not yet known, using `depends_on` with `data` resources will force the read to always be deferred to the apply phase, and therefore a configuration that uses `depends_on` with a `data` resource can never converge. Due to this behavior, we do not recommend using `depends_on` with data resources.
## Multiple Resource Instances
Data resources support [`count`](./resources.html#count-multiple-resource-instances-by-count)