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Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>
(cherry picked from commit 68ffbca7)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
(cherry picked from commit 951445a5)

Signed-off-by: Julien Denize <julien.denize@mistral.ai>
Signed-off-by: Julien Denize <40604584+juliendenize@users.noreply.github.com>
Signed-off-by: Mickael Seznec <mickael@mistral.ai>
Signed-off-by: Roger Wang <hey@rogerw.io>
Co-authored-by: Roger Wang <hey@rogerw.io>
Co-authored-by: Mickael Seznec <mickael@mistral.ai>

Signed-off-by: Tsai, Louie <louie.tsai@intel.com>
Signed-off-by: Louie Tsai <louie.tsai@intel.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Li, Jiang <bigpyj64@gmail.com>

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

Signed-off-by: zhyajie <yajizhan@amd.com>
Co-authored-by: zhyajie <yajizhan@amd.com>

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

Signed-off-by: Wushi Dong <dongws@meta.com>

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

Signed-off-by: Zhang Xiangze <Xiangze.Zhang@arm.com>

Signed-off-by: Shengqi Chen <harry-chen@outlook.com>

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

Signed-off-by: Divakar Verma <divakar.verma@amd.com>

Signed-off-by: Divakar Verma <divakar.verma@amd.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

Signed-off-by: Bradley <bradley.b.pitt@gmail.com>

Signed-off-by: Zuyi Zhao <zhaozuy@amazon.com>

Signed-off-by: Johnny Yang <johnnyyang@google.com>

Signed-off-by: Seiji Eicher <seiji@anyscale.com>
Co-authored-by: rongfu.leng <1275177125@qq.com>

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

Signed-off-by: Zhuohan Li <zhuohan123@gmail.com>
Signed-off-by: Nick Hill <nhill@redhat.com>
Co-authored-by: Nick Hill <nhill@redhat.com>

Signed-off-by: Andrew Xia <axia@fb.com>
Co-authored-by: Andrew Xia <axia@fb.com>

Signed-off-by: Divakar Verma <divakar.verma@amd.com>
Signed-off-by: Divakar Verma <137818590+divakar-amd@users.noreply.github.com>
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Signed-off-by: mgoin <mgoin64@gmail.com>
Co-authored-by: mgoin <mgoin64@gmail.com>

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

Signed-off-by: Alexei V. Ivanov <alexei.ivanov@amd.com>
Signed-off-by: Alexei-V-Ivanov-AMD <156011006+Alexei-V-Ivanov-AMD@users.noreply.github.com>
Co-authored-by: Kevin H. Luu <khluu000@gmail.com>

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

Signed-off-by: Finbarr Timbers <finbarrtimbers@gmail.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: Kevin H. Luu <khluu000@gmail.com>

Signed-off-by: knlnguyen1802 <knlnguyen1802@gmail.com>
Co-authored-by: Chenguang Zheng <645327136@qq.com>
Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>

Signed-off-by: badaoui <abdennacerbadaoui0@gmail.com>

Signed-off-by: sangbumlikeagod <oironese@naver.com>
Signed-off-by: sangbumlikeagod <98077576+sangbumlikeagod@users.noreply.github.com>

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

Signed-off-by: Shengqi Chen <harry-chen@outlook.com>

Signed-off-by: KKKZOZ <kkkzoz@qq.com>

Signed-off-by: Shengqi Chen <harry-chen@outlook.com>

Signed-off-by: Marcin Ostrowski <marcinx.ostrowski@intel.com>

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Signed-off-by: baonudesifeizhai <baonudesifeizhai@gmail.com>
Co-authored-by: baonudesifeizhai <baonudesifeizhai@gmail.com>

Signed-off-by: zhxchen17 <zhxchen17@fb.com>
Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk>