[Doc][Metrics] Fix spec-decode PromQL examples to use the exposed names (#55016)

Signed-off-by: Michele Campi <michele.campi@outlook.com>

Michele Campi committed Sep 14, 2026 at 23:15 UTC d392ac836e17e87f5fec6594ef5ee5b56db72a91
1 file changed +3 -3
vllm/v1/spec_decode/metrics.py
+3 -3
@@ -187,12 +187,12 @@ class SpecDecodingProm:
187
188 1 + (
189 rate(vllm:spec_decode_num_accepted_tokens_total[$interval]) /
190 - rate(vllm:spec_decode_num_drafts[$interval]))
190 + rate(vllm:spec_decode_num_drafts_total[$interval]))
191
192 A per-position acceptance rate vector can be computed using
193
194 - vllm:spec_decode_num_accepted_tokens_per_pos[$interval] /
195 - vllm:spec_decode_num_drafts[$interval]
194 + vllm:spec_decode_num_accepted_tokens_per_pos_total[$interval] /
195 + vllm:spec_decode_num_drafts_total[$interval]
196 """
197
198 _counter_cls = prometheus_client.Counter