### What this PR does / why we need it? Add log Info for MOE_load Imbalance Ratio ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? - vLLM version: v0.12.0 - vLLM main: https://github.com/vllm-project/vllm/commit/v0.12.0 --------- Signed-off-by: daishixun <dsxsteven@sina.com> Co-authored-by: weijinqian0 <1184188277@qq.com>