curl --location '/api/v1/obs/usage?range_days=undefined&group=undefined&team_id=undefined&apikey_id=undefined&model=undefined' \
--header 'Authorization: Bearer <token>'[
{
"group_key": "string",
"request_count": 0,
"prompt_tokens": 0,
"completion_tokens": 0,
"total_tokens": 0,
"cost_rmb": "string",
"avg_latency_ms": 0,
"error_count": 0
}
]