Repository owner assessment aside — filing precise repro + root cause.

### What happened

Per-team per-model rate limits set via `POST /team/update {metadata: {model_rpm_limit: {...}}}` are enforced at **half** the configured value. A team-model limit of `N` starts returning 429 after ~`N/2` requests per window.

### Version `v1.83.14-stable` (also present on `main` as of filing — both code paths below still exist).

### Root cause

In `litellm/proxy/hooks/parallel_request_limiter_v3.py`, `async_pre_call_hook` builds the descriptor list via **two** paths that each append the *same* `model_per_team` descriptor from the *same* `team_metadata["model_rpm_limit"]`:

1. `_create_rate_limit_descriptors()` → team block (~line 1011, via `get_team_model_rpm_limit()`), appends `RateLimitDescriptor(key="model_per_team", value=f"{team_id}:{model}")`. 2. `_add_team_model_rate_limit_descriptor_from_metadata()` (~line 1125, called from `async_pre_call_hook` ~line 1336), appends the **identical** descriptor.

`should_rate_limit()` then puts that counter key into `keys_to_fetch` **twice** (no dedup), and `BATCH_RATE_LIMITER_SCRIPT` (`for i = 1, #KEYS, 2`) does `INCR` per pair → the counter is incre…