[demo] - load-generator Adapt OpenFeature OFREP instead of IN_PROCESS

[aepfli]

OpenFeature supports multiple different modes.
The newest implementation relies on threads and other python internal, which seem to be monkeypatched by locust.
Due to this, the IN_PROCESS mode is not working properly anymore and is causing issues.

Instead we suggest to switch to the OFREP (OpenFeature Remote Evaluation Protocol) for this usecase. This is a simple http call which will return all evaluate flags, and will regularly poll for changes.

This pr contains the helm changes matching open-telemetry/opentelemetry-demo#2114 - but my helm knowledge is limited, please let me know, if i am missing anything here.

[julianocosta89]

hey @aepfli, I've tried to push to your branch, but got permission denied.

You need to:

1. Bump the minor version here: https://github.com/open-telemetry/opentelemetry-helm-charts/blob/main/charts/opentelemetry-demo/Chart.yaml#L4
2. Add the following helm charts locally:
   a. helm repo add open-telemetry https://open-telemetry.github.io/opentelemetry-helm-charts
   b. helm repo add jaeger https://jaegertracing.github.io/helm-charts
   c. helm repo add prometheus https://prometheus-community.github.io/helm-charts
   d. helm repo add grafana https://grafana.github.io/helm-charts
   e. helm repo add opensearch https://opensearch-project.github.io/helm-charts/
3. From the root folder run the command to generate examples:
   a. make generate-examples CHARTS=opentelemetry-demo
4. Commit the modified files.

[aepfli]

thank you for this great explanation - did all the steps and committed all changes

Thank you!

[julianocosta89]

@puckpuck this one should be good to go, should we release 2.0.2?

[puckpuck]

Because this needs a new Load Generator image, we need to make this as part of a Demo 2.0.2 release.

[JaredTan95]

Because this needs a new Load Generator image, we need to make this as part of a Demo 2.0.2 release.

yes, pls update appVersion: 2.0.1 to appVersion: 2.0.2 in chart.yaml when Demo 2.0.2 released. @aepfli

[aepfli]

@JaredTan95 @puckpuck i increased the appVersion ;) thank you

[julianocosta89]

@aepfli you need to generate the examples again 😢

[aepfli]

oh my bad - rookie mistake, fixed and pushed

[julianocosta89]

Demo 2.0.2 released, this one should be good to go!

[aepfli]

is there anything i can do to fix this build?

[julianocosta89]

@aepfli it seems flagd-ui is failing to start due to lack of memory.
https://github.com/open-telemetry/opentelemetry-helm-charts/actions/runs/13856207080/job/38999361225?pr=1563#step:4:19302

This has nothing to do with your PR, but we may need to merge another PR before yours, or add the changes from #1571 in here.

Basically we just need to increase falgd-ui memory to 100M: https://github.com/open-telemetry/opentelemetry-demo/pull/2120/files.

@open-telemetry/helm-approvers what would be the best approach here?