Add Create Deep Dives to development docs

See https://gitlab.com/gitlab-org/create-stage/issues/1 for more context

doc/development/README.md

@@ -61,6 +61,8 @@ description: 'Learn how to contribute to GitLab.'
 - [How Git object deduplication works in GitLab](git_object_deduplication.md)
 - [Geo development](geo.md)
 - [Routing](routing.md)
+- [Repository mirroring](repository_mirroring.md)
+- [Git LFS](lfs.md)
 
 ## Performance guides
 

doc/development/api_graphql_styleguide.md

 # GraphQL API
 
+## Deep Dive
+
+In March 2019, Nick Thomas hosted a [Deep Dive] on GitLab's [GraphQL API] to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 11.9, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[Pull Repository Mirroring functionality]: ../api/graphql/
+[recording on YouTube]: https://www.youtube.com/watch?v=-9L_1MWrjkg
+[Google Slides]: https://docs.google.com/presentation/d/1qOTxpkTdHIp1CRjuTvO-aXg0_rUtzE3ETfLUdnBB5uQ/edit
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/8e78ea7f326b2ef649e7d7d569c26d56/GraphQL_Deep_Dive__Create_.pdf
+
 ## Authentication
 
 Authentication happens through the `GraphqlController`, right now this
@@ -486,4 +496,4 @@ it 'returns a successful response' do
    expect(response).to have_gitlab_http_status(:success)
    expect(graphql_mutation_response(:merge_request_set_wip)['errors']).to be_empty
 end
-```
+```
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doc/development/diffs.md

@@ -6,6 +6,15 @@ Currently we rely on different sources to present diffs, these include:
 - Database (through `merge_request_diff_files`)
 - Redis (cached highlighted diffs)
 
+## Deep Dive
+
+In Jaunary 2019, Oswaldo Ferreira hosted a [Deep Dive] on GitLab's Diffs and Commenting on Diffs functionality to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 11.7, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[recording on YouTube]: https://www.youtube.com/watch?v=K6G3gMcFyek
+[Google Slides]: https://docs.google.com/presentation/d/1bGutFH2AT3bxOPZuLMGl1ANWHqFnrxwQwjiwAZkF-TU/edit
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/b5ad2f336e0afcfe0f99db0af0ccc71a/Create_Deep_Dive__Diffs_and_commenting_on_diffs.pdf
+
 ## Architecture overview
 
 ### Merge request diffs
@@ -124,4 +133,4 @@ File diff will be suppressed (technically different from collapsed, but behaves
 Diff Viewers, which can be found on `models/diff_viewer/*` are classes used to map metadata about each type of Diff File. It has information
 whether it's a binary, which partial should be used to render it or which File extensions this class accounts for.
 
-`DiffViewer::Base` validates _blobs_ (old and new versions) content, extension and file type in order to check if it can be rendered.
+`DiffViewer::Base` validates _blobs_ (old and new versions) content, extension and file type in order to check if it can be rendered.
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doc/development/elasticsearch.md

@@ -4,6 +4,16 @@ This area is to maintain a compendium of useful information when working with el
 
 Information on how to enable ElasticSearch and perform the initial indexing is kept in ../integration/elasticsearch.md#enabling-elasticsearch
 
+## Deep Dive
+
+In June 2019, Mario de la Ossa hosted a [Deep Dive] on GitLab's [ElasticSearch integration] to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 12.0, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[ElasticSearch integration]: ../integration/elasticsearch.md
+[recording on YouTube]: https://www.youtube.com/watch?v=vrvl-tN2EaA
+[Google Slides]: https://docs.google.com/presentation/d/1H-pCzI_LNrgrL5pJAIQgvLX8Ji0-jIKOg1QeJQzChug/edit
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/c5aa32b6b07476fa8b597004899ec538/Elasticsearch_Deep_Dive.pdf
+
 ## Initial installation on OS X
 
 It is recommended to use the Docker image. After installing docker you can immediately spin up an instance with

doc/development/gitaly.md

@@ -3,6 +3,16 @@
 [Gitaly](https://gitlab.com/gitlab-org/gitaly) is a high-level Git RPC service used by GitLab CE/EE,
 Workhorse and GitLab-Shell.
 
+## Deep Dive
+
+In May 2019, Bob Van Landuyt hosted a [Deep Dive] on GitLab's [Gitaly project] and how to contribute to it as a Ruby developer, to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 11.11, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[Gitaly project]: https://gitlab.com/gitlab-org/gitaly
+[recording on YouTube]: https://www.youtube.com/watch?v=BmlEWFS8ORo
+[Google Slides]: https://docs.google.com/presentation/d/1VgRbiYih9ODhcPnL8dS0W98EwFYpJ7GXMPpX-1TM6YE/edit
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/a4fdb1026278bda5c1c5bb574379cf80/Create_Deep_Dive__Gitaly_for_Create_Ruby_Devs.pdf
+
 ## Beginner's guide
 
 Start by reading the gitaly repository's

doc/development/lfs.md

+# Git LFS
+
+## Deep Dive
+
+In April 2019, Francisco Javier López hosted a [Deep Dive] on GitLab's [Git LFS] implementation to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 11.10, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[Git LFS]: ../workflow/lfs/manage_large_binaries_with_git_lfs.html
+[recording on YouTube]: https://www.youtube.com/watch?v=Yyxwcksr0Qc
+[Google Slides]: https://docs.google.com/presentation/d/1E-aw6-z0rYd0346YhIWE7E9A65zISL9iIMAOq2zaw9E/edit
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/07a89257a140db067bdfb484aecd35e1/Git_LFS_Deep_Dive__Create_.pdf
\ No newline at end of file

doc/development/repository_mirroring.md

+# Repository mirroring
+
+## Deep Dive
+
+In December 2018, Tiago Botelho hosted a [Deep Dive] on GitLab's [Pull Repository Mirroring functionality] to share his domain specific knowledge with anyone who may work in this part of the code base in the future. You can find the [recording on YouTube], and the slides on [Google Slides] and in [PDF]. Everything covered in this deep dive was accurate as of GitLab 11.6, and while specific details may have changed since then, it should still serve as a good introduction.
+
+[Deep Dive]: https://gitlab.com/gitlab-org/create-stage/issues/1
+[Pull Repository Mirroring functionality]: ../workflow/repository_mirroring.md#pulling-from-a-remote-repository-starter
+[recording on YouTube]: https://www.youtube.com/watch?v=sSZq0fpdY-Y
+[Google Slides]: https://docs.google.com/presentation/d/17BTT6M6RyNRckV4wTt-dr07nIfBvD325_xVBoLtSoPM/edit?usp=sharing
+[PDF]: https://gitlab.com/gitlab-org/create-stage/uploads/8693404888a941fd851f8a8ecdec9675/Gitlab_Create_-_Pull_Mirroring_Deep_Dive.pdf
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