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Signed-off-by: Nick Hill <nhill@redhat.com>

Signed-off-by: Rohan138 <rohanpotdar138@gmail.com>

Better error when world size is larger than node and `distributed_executor_backend` is not set (#30140)
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Co-authored-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com>
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Signed-off-by: Alec Solder <alecs@fb.com>
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Signed-off-by: Max Hu <hyoung2991@gmail.com>
Signed-off-by: Max Hu <maxhu@nvidia.com>
Co-authored-by: Max Hu <maxhu@nvidia.com>

[Frontend][Model] Add 'float16' to possible mamba cache dtype values, override mamba SSM cache dtype value for NemotronH (#29978)
Signed-off-by: amitz-nv <203509407+amitz-nv@users.noreply.github.com>

Signed-off-by: QiuChunshuo <qiuchunshuo@huawei.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

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Signed-off-by: Julien Denize <julien.denize@mistral.ai>
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Introduces three new Prometheus histograms for fine-grained observability of KV cache residency behavior:

vllm:kv_block_lifetime_seconds — total lifetime from allocation to free
vllm:kv_block_idle_before_evict_seconds — idle duration before eviction
vllm:kv_block_reuse_gap_seconds — time between consecutive reuses of the same block

These metrics help operators analyze KV cache efficiency, reuse patterns, and eviction timing beyond simple utilization rates.

Implementation uses monotonic timestamps for accuracy, 1% sampling for minimal overhead (~48 bytes/block), and is fully thread-safe with zero runtime cost when disabled.

Two new runtime flags are introduced:

--kv-cache-metrics – enable KV cache residency metrics
--kv-cache-metrics-sample – control sampling ratio (default: 0.01)
Signed-off-by: Shivam <shivamprasad91@gmail.com>

Signed-off-by: Frederic Odermatt <frederic.odermatt@44ai.ch>

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

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Signed-off-by: Injae Ryou <injaeryou@gmail.com>
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Signed-off-by: George D. Torres <gdavtor@gmail.com>
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Signed-off-by: Russell Bryant <rbryant@redhat.com>
Co-authored-by: Russell Bryant <rbryant@redhat.com>