Telegraf release and docs build

The Telegraf release build process (using code in influxdata/telegraf-internal) includes automation for building influxdata/docs-v2 documentation from influxdata/telegraf plugin README files.

Release build process

Telegraf team triggers the release script, which generates a docs binary. The binary takes a Telegraf release version tag as an argument.
When executed (by the Telegraf team for an official release or on your local system for testing), the binary:

a. Clones the docs-v2 repo and the telegraf repo and checks out the specified release tag. b. Applies docs-v2 frontmatter templates (docs-v2/telegraf-build/templates) to the telegraf plugin README files. c. Commits the changes to the local docs-v2 repo and creates a PR for the changes.

Build Telegraf docs for local testing and preview

[!Warn]

Use the following steps for local testing and preview only.

Don't commit the generated files to version control.

Submit edits and fixes to the /influxdata/telegraf repo. The Telegraf release process triggers documentation builds and submits them to influxdata/docs-v2 for review.

Follow steps to test the Telegraf docs build process and preview generated docs on your local system (not for an official Telegraf release):

Build using Docker
Build manually

Run Docker to build Telegraf docs for testing and preview

If you don't already have an SSH key pair, generate one for your GitHub-associated email address, add your private key to your SSH agent, and add then add the public key to your GitHub account.

The Dockerfile leverages Docker's BuildKit and the --ssh flag to use your SSH keys for GitHub authentication.

Open a terminal and navigate to the directory containing the Dockerfile (./scripts), then enter the following command to build the Docker image:
bash
```
docker build --ssh default -t telegraf-build .
```

Run the Docker container using the built image and mount a volume to /app/repos/docs-v2/telegraf:

bash

docker run --rm \
-v /Users/me/Documents/github/docs-v2/content/telegraf:/app/repos/docs-v2/content/telegraf \
telegraf-build v1.33.0

Replace /Users/me/Documents/github/docs-v2/content/telegraf with the actual path on your host machine where you want to access the generated documentation.

Manually build Telegraf docs for testing and preview

To test manually run the build process on your local system (without a release triggered by influxdata/telegraf):

Install a recent version of Go for your system.
Clone the influxdata/telegraf-internal repo to your local system (for example, to ~/Documents/github/telegraf-internal)
To generate the release binaries (telegraf-internal/telegraf_release/bin/),change into the ~/Documents/github/telegraf-internal directory and run make.
To generate the documentation, run the telegraf-internal/telegraf_release/bin/docs binary and include the Telegraf release tag to build--for example:

bash

# Change to `telegraf-build` in your local docs-v2 repo.
cd ~/Documents/github/docs-v2/telegraf-build
 # Run the `docs` binary to generate the documentation.
~/Documents/github/telegraf-internal/telegraf_release/bin/docs v1.33.0

You can skip steps for local testing:

bash

 ~/Documents/github/telegraf-internal/telegraf_release/bin/docs -skip changelog,pull-request v1.33.0

The binary looks for .tmpl template files in ./templates telegraf-internal/telegraf_release/docs/templates/, however we expect to permanently move them to docs-v2/telegraf-build/templates soon.

The docs binary: a. Clones the docs-v2 repo and the telegraf repo and checks out the specified Telegraf release tag. b. Commits the changes to the local docs-v2 repo and creates a PR for the changes.

To test the templates and preview the changes on your local machine, change to telegraf-build/repos/docs-v2, install dependencies, and start Hugo:
bash
```
cd ~/Documents/github/docs-v2/telegraf-build/repos/docs-v2
# Install dependencies
yarn install
# Start Hugo server
npx hugo serve
```
Alternatively, copy the generated files your existing local docs-v2 repo (but, don't commit them to version control).