Support engine.graphVariant and APOLLO_GRAPH_VARIANT. (apollographql/…

…apollo-server#3924) Co-authored-by: Adam Zionts <[email protected]> Apollo-Orig-Commit-AS: apollographql/apollo-server@275945d
apollographql · Apr 23, 2020 · 0f614e1 · 0f614e1
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diff --git a/gateway-js/CHANGELOG.md b/gateway-js/CHANGELOG.md
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 > The changes noted within this `vNEXT` section have not been released yet.  New PRs and commits which introduce changes should include an entry in this `vNEXT` section as part of their development.  When a release is being prepared, a new header will be (manually) created below and the the appropriate changes within that release will be moved into the new section.
 
+- Deprecated the `APOLLO_SCHEMA_TAG` environment variable in favor of its new name, `APOLLO_GRAPH_VARIANT`.  The functionality remains otherwise identical, but the new name mirrors the name used within Apollo Graph Manager.  Use of the now-deprecated name will result in a deprecation warning and support will be dropped completely in a future "major" update.  To avoid misconfiguration, runtime errors will be thrown if the new and deprecated name are _both_ set. [#3855](https://github.com/apollographql/apollo-server/pull/3855)
 - Cache stringified representations of downstream query bodies within the query plan to address performance implications incurred by repeatedly `print`ing the same`DocumentNode`s with the `graphql` printer.  This improvement is more pronounced on larger documents.  [PR #4018](https://github.com/apollographql/apollo-server/pull/4018)
 - Add inadvertently excluded `apollo-server-errors` runtime dependency. [#3927](https://github.com/apollographql/apollo-server/pull/3927)