FDN-4261: downsize heap for dependency-api and dependency-www

[nicolagi]

Summary

• dependency-api: heap 2100m → 1536m, container 3000Mi → 2Gi
  • Live data P95 281M with periodic spikes to ~1G (batch operations)
  • 1536m provides headroom for spikes while reducing waste
• dependency-www: heap 2100m → 512m, container 2700Mi → 768Mi
  • Live data P95 84M, max 278M
  • 512m gives ~2x headroom over peak

Test plan

• ArgoCD diff passes
• Monitor for Degenerated GCs after deploy
• Validate with WARN_MS=1 SINCE=5m ./scripts/validate-gc-pauses.sh dependency-api-live
• Validate with WARN_MS=1 SINCE=5m ./scripts/validate-gc-pauses.sh dependency-www-live

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Optimized memory resource allocations for system efficiency across application deployments.

[coderabbitai]

📝 Walkthrough

Walkthrough

Two Helm configuration files updated: dependency-api increases container memory limits and requests while reducing JVM heap, and dependency-www reduces both container memory and JVM memory allocations.

Changes

Cohort / File(s)	Summary
Helm Chart Resource Configs deploy/dependency-api/values.yaml, deploy/dependency-www/values.yaml	Container memory limits/requests and JVM heap configurations adjusted; dependency-api increases container memory (3000Mi→2Gi) while reducing JVM heap (2100m→1536m); dependency-www reduces both container memory (2700Mi→768Mi) and JVM heap (2100m→512m).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly and specifically describes the main change: downsizing JVM heap allocations for two Kubernetes deployments (dependency-api and dependency-www), which aligns with the core objective of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[flow-tech]

Argo diff output for dependency-www:

===== apps/Deployment production/dependency-www-live ======
551c551
<           value: -Xms2100m -Xmx2100m -XX:+UseShenandoahGC -XX:+HeapDumpOnOutOfMemoryError
---
>           value: -Xms512m -Xmx512m -XX:+UseShenandoahGC -XX:+HeapDumpOnOutOfMemoryError
639c639
<             memory: 2700Mi
---
>             memory: 768Mi
642c642
<             memory: 2700Mi
---
>             memory: 768Mi

===== datadoghq.com/DatadogMonitor datadog/dependency-www-errorrate ======
146d145
<   - generated:kubernetes

[flow-tech]

Argo diff output for dependency-api:

===== apps/Deployment production/dependency-api-live ======
551c551
<           value: -Xms2100m -Xmx2100m -XX:+UseShenandoahGC -XX:+HeapDumpOnOutOfMemoryError
---
>           value: -Xms1536m -Xmx1536m -XX:+UseShenandoahGC -XX:+HeapDumpOnOutOfMemoryError
639c639
<             memory: 3000Mi
---
>             memory: 2Gi
642c642
<             memory: 3000Mi
---
>             memory: 2Gi

===== datadoghq.com/DatadogMonitor datadog/dependency-api-errorrate ======
146d145
<   - generated:kubernetes

[nicolagi]