[cleanup] remove metric checker and long tests - #1603
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- Add sglang_parse_args() for independent sglang arg parsing (Phase 1) - Add megatron_parse_args() / fsdp_parse_args() with ignore_unknown_args (Phase 2) - Move backend-specific validation and defaults into respective backend modules - Unify naming: sglang_parse_args, megatron_parse_args, fsdp_parse_args - Pre-parse --train-backend, --debug-* flags in _pre_parse_mode() to avoid duplication - Remove dead code parse_args_train_backend() - Add test: test_qwen2.5_0.5B_debug_rollout_then_train.py (rollout-only then train-only) - Register new test in CI (run-ci-megatron, run-ci-image)
…g args.debug_rollout_only args.debug_rollout_only is now set by _pre_parse_mode and merged after megatron_parse_args returns, so it's not available during parsing.
Skip megatron init(args) entirely in debug_rollout_only mode since megatron_validate_args is not run and attributes like virtual_pipeline_model_parallel_size are not set.
- actor.train: early return before _get_rollout_data (rollout manager returns None) - rollout manager: skip _convert_samples_to_train_data in debug_rollout_only - fix typo: self.debug_rollout_only -> self.args.debug_rollout_only - move log_rollout_data out of debug_rollout_only branch
- train_actor: skip set_train_parallel_config when debug_rollout_only (train_parallel_config is not set since actor.init returns early) - rollout: skip trim/dynamic-batch-size logic in debug_rollout_only (avoids accessing unset train_parallel_config)
- Remove MetricChecker class and all related code (ci_metric_checker_key/threshold args) - Delete 5 long-running test files: test_qwen2.5_0.5B_gsm8k, test_qwen2.5_0.5B_gsm8k_async, test_qwen3_0.6B_fsdp_colocated_2xGPU, test_qwen3_0.6B_fsdp_distributed, test_external_rollout - Remove e2e-test-long CI job and update e2e-test-fsdp/e2e-test-image accordingly
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