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Phase out W&B in favor of Prime Platform for training logging #2514

@mikasenghaas

Description

@mikasenghaas

We currently dual-log to both W&B and the Prime Platform (prime_monitor). Goal is to make the Prime Platform the single source of truth for training runs and phase out W&B.

Steps

  • Audit what W&B provides that Prime Platform doesn't yet (loss curves, sample tables, config diffing, artifact tracking)
  • Close any gaps on the Prime Platform side
  • Migrate existing references (blog posts, SUMMARY.md links, internal docs) from W&B URLs to Prime Platform URLs
  • Remove [wandb] config section from training configs and the W&B integration code from prime-rl
  • Ensure prime_monitor captures all metrics currently logged to W&B (reward, loss, grad_norm, throughput, samples, etc.)

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