Customize the OpenTelemetry demo for Splunk

[dmitchsplunk]

Changes

I've made a number of customizations to the upstream OpenTelemetry demo for use with Splunk Cloud/Enterprise and Splunk Observability Cloud. These include:

• Replacing the upstream collector from the docker.yml file with the Splunk distro of the collector.
• Removing the upstream collector from the kubernetes/opentelemetry-demo.yaml file (since it will be installed via helm instead), and modified the other services in this file to use the Splunk distro of the collector running on the K8s node.
• Updated the README instructions to point Lantern blog articles for deploying the demo.

Merge Requirements

For new features contributions please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the docs
• Appropriate Helm chart updates in the helm-charts

Maintainers will not merge until the above have been completed. If you're unsure
which docs need to be changed ping the
@open-telemetry/demo-approvers.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[jvoravong]

Can we develop a script (example) or GitHub workflow to automate the synchronization of this demo with the upstream source? It's crucial to either automate the update process or provide detailed documentation for the process. This will facilitate incorporating changes from the upstream project over time.

[dmitchsplunk]

Thanks for the example script @jvoravong , I'll see what I can do.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[dmitchsplunk]

@jvoravong FYI, I've made good progress on automating the process of applying my changes to the upstream version, but still have work to do before the PR is ready to be reviewed.

[dmitchsplunk]

Hi @jvoravong - the requested changes are ready for your review.

To make future merges with upstream straightforward, the only files changed are in a new folder named "splunk". Everything else is aligned with upstream exactly.

A new script was added named "update-demos.sh" that can be run after merging with upstream to regenerate the splunk-specific config.

[jvoravong]

Some small nits. LGTM overall.

[dmitchsplunk]

Thanks @jvoravong , I've made the suggested changes. I believe @atoulme is the owner of this repo and will need to approve the merge.

[atoulme]

@jvoravong you should have powers to merge now.