GitLab

Signed-off-by: Boyuan Feng <boyuan@meta.com>

Signed-off-by: Wei Wei <wwei6@meta.com>

Signed-off-by: leo-pony <nengjunma@outlook.com>

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>

Signed-off-by: Xingyu Liu <charlotteliu12x@gmail.com>
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Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

Signed-off-by: zhxchen17 <zhxchen17@fb.com>

Signed-off-by: Yanan Cao <gmagogsfm@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io>
Signed-off-by: wang.yuqi <noooop@126.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

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

Signed-off-by: Injae Ryou <injaeryou@gmail.com>
Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>

Signed-off-by: Didier Durand <durand.didier@gmail.com>

Signed-off-by: morrison-turnansky <mturnans@redhat.com>
Signed-off-by: adabeyta <aabeyta@redhat.com>
Signed-off-by: Morrison Turnansky <mturnans@redhat.com>
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Co-authored-by: Luka Govedič <ProExpertProg@users.noreply.github.com>
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Signed-off-by: George D. Torres <gdavtor@gmail.com>
Signed-off-by: George D. Torres <41129492+geodavic@users.noreply.github.com>
Signed-off-by: Russell Bryant <rbryant@redhat.com>
Co-authored-by: Russell Bryant <rbryant@redhat.com>

Signed-off-by: Lu Fang <fanglu@fb.com>
Co-authored-by: Lucia (Lu) Fang <fanglu@meta.com>

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Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

Signed-off-by: wxsIcey <1790571317@qq.com>
Signed-off-by: Mengqing Cao <cmq0113@163.com>
Signed-off-by: Icey <1790571317@qq.com>
Co-authored-by: Mengqing Cao <cmq0113@163.com>

Signed-off-by: manayang <jackmanayang@gmail.com>
Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Signed-off-by: Roger Wang <hey@rogerw.io>
Co-authored-by: sergeywang <sergeywang@tencent.com>
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Co-authored-by: manayang <manayang@tencent.com>
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Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

Add option to use unbacked, and backed size obl dynamic shapes for more sounds compilation. (#26199)
Signed-off-by: Laith Sakka <lsakka@meta.com>

Signed-off-by: David Chen <530634352@qq.com>
Co-authored-by: SunChenxiang123 <1291824390@qq.com>

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

Signed-off-by: Boyuan Feng <boyuan@meta.com>

Signed-off-by: Jee Jee Li <pandaleefree@gmail.com>

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>
Co-authored-by: Michael Goin <mgoin64@gmail.com>

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>

Signed-off-by: QiuChunshuo <qiuchunshuo@huawei.com>
Signed-off-by: FENP <yuanyongjie.yyj@antgroup.com>
Signed-off-by: LookAround <lixushi@huawei.com>
Signed-off-by: Jingchun Gao <gaojingchun1@huawei.com>
Signed-off-by: zhenwenqi2024 <zhenwenqi_2022@qq.com>
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Co-authored-by: Jingchun Gao <63247409+gjc0824@users.noreply.github.com>