README: Add a link to the Gitaly Training channel

Now that we have more Gitaly training videos, we've conslidated these
all into one youtube unfiltered playlist. Let's replace the existing
block of text with a link to the playlist so that we don't have to keep
updating this README when we do more training videos.

1 files changed, 5 insertions, 66 deletions

diff --git a/README.md b/README.md
index f79ff1178..17e5f8ef0 100644
--- a/README.md
+++ b/README.md
@@ -152,74 +152,13 @@ Gitaly supports Continuous Profiling through [LabKit][] using [Stackdriver Profi
 
 For more information on how to set it up, see the [LabKit monitoring docs](https://gitlab.com/gitlab-org/labkit/-/blob/master/monitoring/doc.go).
 
-## Presentations
-
-- [Praefect code walkthrough](https://youtu.be/w2R4ptDLPH4)
-
-  A walkthrough of the Praefect codebase.
-
-- [How to configure backpressure in Gitaly](https://youtu.be/wX9CtFdLYxE)
-
-  An overview of the knobs in the Gitaly config to set limits on incoming traffic.
-  There is also [written documentation](doc/backpressure.md).
-
-- [How Gitaly fits into GitLab (Youtube)](https://www.youtube.com/playlist?list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy) - a series of 1-hour training videos for contributors new to GitLab and Gitaly.
-  - [Part 1: the Gitaly client in `gitlab-ce`, 2019-02-21](https://www.youtube.com/watch?v=j0HNiKCnLTI&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
-
-    Overview of GitLab backend processes, GitLab Rails deep dive: Gitaly
-    config in GitLab Rails, SQL data model, overview of how Gitaly calls get
-    made via GitalyClient.call.
-
-  - [Part 2: Git SSH, 2019-02-28](https://www.youtube.com/watch?v=0kY0HPFn25o&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
-
-    What is in a `gitaly-proto` Repository message, legacy vs
-    hashed storage (repository directories), `git clone` via SSH,
-    `gitlab-shell`, `authorized_keys` and forced commands, what happens
-    during `git push`.
+## Training Videos
 
-  - [Part 3: Git push, 2019-03-07](https://www.youtube.com/watch?v=-kXYycFYDzo&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
+The [Gitaly Training and Resources Playlist](https://www.youtube.com/playlist?list=PL05JrBw4t0KqPMCB7xW1ExIRp6YuD_7_N)
+contains videos that give an overview into how Gitaly works, as well as dive
+deep into different parts of Gitaly and even Git.
 
-    A closer look at the final stage of `git push` where the Git hooks run
-    and the refs get updated. Interaction between the Git hooks and GitLab
-    internal API. The Git
-    [object quarantine mechanism](https://git-scm.com/docs/git-receive-pack#_quarantine_environment).
-    Preview of Git HTTP (to be discussed next time).
-
-  - [Part 4: Git HTTP, 2019-03-14](https://www.youtube.com/watch?v=lM13p8lCu8A&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
-
-    Intercepting Git HTTP traffic with mitmproxy, overview of
-    Git HTTP clone steps, code walk in `gitlab-workhorse` and `gitlab-ce`,
-    investigating internal workhorse API messages used for Git HTTP.
-
-  - [Part 5: Merge Requests across Forks, 2019-03-21](https://www.youtube.com/watch?v=yGSuOz0XOHQ&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
-
-    Fixing a locally broken Ruby gem C
-    extension by recompiling, demo of how creating a MR across forks
-    causes new commits to suddenly appear in the fork parent repository,
-    deep dive into the FetchSourceBranch RPC, adding debug code to see
-    how address and authentication metadata is passed down to
-    `gitaly-ruby`, failed attempt to log `gitaly-ssh` arguments, comparison
-    of `gitaly-ssh` and `gitlab-shell`, a Gitaly server can end up making RPC calls to itself.
-
-  - [Part 6: Creating Git commits on behalf of Git users, 2019-03-21](https://www.youtube.com/watch?v=Rbe0KGTLkxY&list=PL05JrBw4t0KqoFUiX42JG7BAc7pipMBAy)
-
-    Demonstrate how usually Git hooks are run by
-    `git-receive-pack`, but sometimes by `gitaly-ruby`. Deep dive into
-    UserCommitFiles: where do those hooks actually get run? A look at
-    UserMerge. How does Gitaly make merge commits. A look at the
-    implementation of the special feature where users are not allowed
-    push to a branch, but are allowed to merge into it.
-
-  - [Part 7: How Gitaly uses Prometheus monitoring, 2019-07-09](https://youtu.be/R6F674Nj3wI)
-
-    What is [Prometheus](https://prometheus.io/). Reconstructing a
-    [Grafana](https://dashboards.gitlab.net) dashboard panel
-    with [PromQL](https://prometheus.io/docs/prometheus/latest/querying/basics/).
-    Adding a new counter to Gitaly. Querying Prometheus in Gitaly
-    during development. Comparing latency calculation with
-    [ELK](https://log.gitlab.net). [GRPC Prometheus
-    middleware](https://github.com/grpc-ecosystem/go-grpc-prometheus)
-    in Gitaly.
+## Presentations
 
 - [TheConf talk on Scaling GitLab Git storage with Gitaly, 2019-08-16](https://speakerdeck.com/olsfer/how-gitlab-scaled-git-access-with-a-go-service)
 - [Infrastructure Team Update 2017-05-11](https://about.gitlab.com/2017/05/11/functional-group-updates/#infrastructure-team)