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[V1][Metrics] Updated list of deprecated metrics in v0.8 (#14695)

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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
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docs/source/serving/metrics.md
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@ -39,7 +39,16 @@ The following metrics are exposed:
The following metrics are deprecated and due to be removed in a future version:
- *(No metrics are currently deprecated)*
- `vllm:num_requests_swapped`, `vllm:cpu_cache_usage_perc`, and
`vllm:cpu_prefix_cache_hit_rate` because KV cache offloading is not
used in V1.
- `vllm:gpu_prefix_cache_hit_rate` is replaced by queries+hits
counters in V1.
- `vllm:time_in_queue_requests` because it duplicates
`vllm:request_queue_time_seconds`.
- `vllm:model_forward_time_milliseconds` and
`vllm:model_execute_time_milliseconds` because
prefill/decode/inference time metrics should be used instead.
Note: when metrics are deprecated in version `X.Y`, they are hidden in version `X.Y+1`
but can be re-enabled using the `--show-hidden-metrics-for-version=X.Y` escape hatch,