Update design for PR #3173: chore(deps): bump urllib3 from 2.5.0 to 2.6.0 in /src/loadgenerator

pr-analysis-3173.md

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+# PR #3173: Workflow Design Impact Analysis
+
+## Affected Workflows
+- **Local Development Workflow (Workflow 1)**: Justification - The PR modifies `src/loadgenerator/requirements.txt`, which is consumed during the Docker build for the loadgenerator service as defined in `skaffold.yaml` (artifact with context `src/loadgenerator`). The workflow's design document ([.exp/design-workflow-1-local-development-workflow.md](.exp/design-workflow-1-local-development-workflow.md)) describes Skaffold building artifacts from `src/<service>` directories, including loadgenerator via its config. This impacts the dependencies in the built image used for local load testing.
+- **GKE Deployment Workflow (Workflow 2)**: Justification - Similar to Workflow 1, this workflow uses `skaffold run` to build and push images, including loadgenerator. The design document ([.exp/design-workflow-2-gke-deployment-workflow.md](.exp/design-workflow-2-gke-deployment-workflow.md)) notes configs for app and loadgenerator in the build loop. The dependency update affects the pushed image to Artifact Registry.
+
+## Additional Workflows Analysis
+
+### Helm Chart Deployment (Workflow 3)
+#### Summary of design changes
+The PR does not alter the Helm chart deployment process or templates (e.g., templates/loadgenerator.yaml). However, the loadgenerator service deployed via Helm will benefit from the updated urllib3 if its Docker image is rebuilt with the new requirements.txt and referenced in values.yaml (e.g., image tags).
+
+- **Affected aspects**: Runtime security and performance of loadgenerator in Helm releases.
+- **How implemented**: External to workflow; build via docker/Skaffold, then helm upgrade with custom image.
+- **Benefits/Implications**: Prevents vulnerabilities in load testing within Helm-managed environments like GKE or local clusters. No changes to Mermaid diagrams or doc needed.
+
+### Kustomize Customization and Deployment (Workflow 4)
+#### Summary of design changes
+Kustomize applies customized manifests including loadgenerator (base/loadgenerator.yaml and components like without-loadgenerator). The PR impacts the image used in these deployments.
+
+- **Affected aspects**: Enhanced loadgenerator functionality in customized clusters (e.g., with Istio, network policies).
+- **Implementation**: Image update outside Kustomize; workflow unchanged.
+- **Benefits**: Secures traffic simulation in customized setups. No diagram updates required.
+
+### Terraform Infrastructure Provisioning (Workflow 5)
+#### Summary of design changes
+Terraform creates GKE cluster and optional Memorystore; app deployment (with loadgenerator) follows via other tools. Updated deps improve load testing post-provisioning.
+
+- **Affected aspects**: Indirect; benefits infra-backed deployments.
+- **Implications**: Aligns with base manifests in kustomize/ used after terraform apply.
+- No changes to provisioning design or diagrams.
+
+For workflows 6 (Cloud Build) and 7 (Release), similar build impacts as 1/2, but without .exp docs, no detailed analysis here. Recommend reviewing their scripts (cloudbuild.yaml, docs/releasing/make-docker-images.sh) confirm loadgenerator build inclusion.
+
+[PR #3173](https://github.com/GoogleCloudPlatform/microservices-demo/pull/3173)
+
+## Local Development Workflow Analysis
+### Summary of design changes
+[Summary text as before]
+
+The initial deployment Mermaid diagram needs a minor update to reflect the enhanced build for loadgenerator. Below is the diff visualization (yellow notes indicate changes/additions from PR):
+
+```mermaid
+sequenceDiagram
+    participant D as Developer
+    participant S as Skaffold
+    participant B as Docker Build
+    participant K as K8s Cluster
+    D->>S: skaffold dev
+    S->>S: Load skaffold.yaml (artifacts, manifests)
+    loop For each artifact
+        S->>B: docker build -t <image>:<tag> src/<service>
+        B->>B: Build image from Dockerfile
+        alt loadgenerator artifact (PR impact)
+            Note over B: Change (yellow): urllib3 bumped to 2.6.0 in requirements.txt
+            Note over B: Addition (green): Security fixes (CVEs), perf improvements, Python 3.14 support
+        end
+    end
+    S->>K: kustomize build kubernetes-manifests/ | kubectl apply -f -
+    K->>K: Create Deployments, Services, Pods
+    Note over S,K: Pods pull local images and start
+    D->>K: kubectl port-forward deployment/frontend 8080:8080
+    Note over D: Access app at http://localhost:8080
+```
+
+The hot reload diagram is unaffected, as dep updates occur at initial build or via file change triggering rebuild of requirements-related files.
+
+### Updated Design Recommendation
+No update to original .exp doc required, as change is implementation detail. However, if detailing build internals, add note about dependency management via requirements.txt files in service dirs.
+
+## GKE Deployment Workflow Analysis
+### Summary of design changes
+[Similar]
+
+The sequence diagram's build loop is similarly impacted. Diff visualization:
+
+```mermaid
+sequenceDiagram
+    participant U as User/CLI
+    participant S as Skaffold
+    participant B as Builder (Docker/Buildkit)
+    participant R as Registry
+    participant K as Kustomize
+    participant C as GKE Cluster
+    U->>S: skaffold run --default-repo=<registry>
+    Note over S: Parse skaffold.yaml<br/>Configs: app, loadgenerator
+    loop For each service artifact
+        S->>B: Build image from src/<service>/Dockerfile
+        B->>B: Use local Docker or GCB
+        B->>R: Push to registry
+        alt loadgenerator (PR change)
+            Note over B,R: Yellow: Updated deps in image pushed (urllib3 2.6.0)
+            Note over B,R: Green: Enhanced security & features in load testing component
+        end
+    end
+    S->>K: kustomize build
+    K->>C: kubectl apply
+    C->>C: Deploy
+```
+
+[Similar recommendation]
+
+[PR link]