Метрики /metrics для центрального Prometheus + генерация scrape-таргетов

--metrics-port (0.0.0.0, в отличие от --health-port — тот 127.0.0.1-only)
отдаёт netrunner_connections_active/total, netrunner_auth_validate_duration_seconds,
netrunner_auth_failures_total, netrunner_circuit_breaker_open. Тот же
hand-rolled HTTP-паттерн, что и health.rs — без HTTP-фреймворка ради
одного эндпоинта.

scripts/generate-prometheus-targets.mjs генерит список scrape-таргетов
из nodes.json — job update-observability-targets в deploy.yml гоняет
его при каждом деплое нод и заливает на VPS с данными
(netrunner-data/observability/targets/nodes.json), чтобы центральный
Prometheus не терял из виду ноды без ручной правки конфига.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Cargo.lock

@@ -572,6 +572,15 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d6914041f254d6e9176c01941b21115dcfb7089e55135a35411081bd106ef3f"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.21"
@@ -771,6 +780,17 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "evmap"
+version = "11.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b8874945f036109c72242964c1174cf99434e30cfa45bf45fedc983f50046f8"
+dependencies = [
+ "hashbag",
+ "left-right",
+ "smallvec",
+]
+
 [[package]]
 name = "fastrand"
 version = "2.4.1"
@@ -929,6 +949,21 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "generator"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3b854b0e584ead1a33f18b2fcad7cf7be18b3875c78816b753639aa501513ae"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "libc",
+ "log",
+ "rustversion",
+ "windows-link",
+ "windows-result",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -1025,6 +1060,12 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "hashbag"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7040a10f52cba493ddb09926e15d10a9d8a28043708a405931fe4c6f19fac064"
+
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
@@ -1459,6 +1500,17 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
 
+[[package]]
+name = "left-right"
+version = "0.11.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f0c21e4c8ff95f487fb34e6f9182875f42c84cef966d29216bf115d9bba835a"
+dependencies = [
+ "crossbeam-utils",
+ "loom",
+ "slab",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.184"
@@ -1512,6 +1564,19 @@ version = "0.4.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e5032e24019045c762d3c0f28f5b6b8bbf38563a65908389bf7978758920897"
 
+[[package]]
+name = "loom"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "419e0dc8046cb947daa77eb95ae174acfbddb7673b4151f56d1eed8e93fbfaca"
+dependencies = [
+ "cfg-if",
+ "generator",
+ "scoped-tls",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "lru"
 version = "0.16.3"
@@ -1548,6 +1613,48 @@ version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
 
+[[package]]
+name = "metrics"
+version = "0.24.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89550ee9f79e88fef3119de263694973a8adb26c21d75322164fb8c493039fe2"
+dependencies = [
+ "portable-atomic",
+ "rapidhash",
+]
+
+[[package]]
+name = "metrics-exporter-prometheus"
+version = "0.18.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1db0d8f1fc9e62caebd0319e11eaec5822b0186c171568f0480b46a0137f9108"
+dependencies = [
+ "base64",
+ "evmap",
+ "indexmap",
+ "metrics",
+ "metrics-util",
+ "quanta",
+ "thiserror 2.0.18",
+]
+
+[[package]]
+name = "metrics-util"
+version = "0.20.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96f8722f8562635f92f8ed992f26df0532266eb03d5202607c20c0d7e9745e13"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+ "hashbrown 0.16.1",
+ "metrics",
+ "quanta",
+ "rand 0.9.2",
+ "rand_xoshiro",
+ "rapidhash",
+ "sketches-ddsketch",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -1654,6 +1761,8 @@ dependencies = [
  "async-trait",
  "clap",
  "dashmap",
+ "metrics",
+ "metrics-exporter-prometheus",
  "netrunner-core",
  "netrunner-logger",
  "reqwest",
@@ -1869,6 +1978,21 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "quanta"
+version = "0.12.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3ab5a9d756f0d97bdc89019bd2e4ea098cf9cde50ee7564dde6b81ccc8f06c7"
+dependencies = [
+ "crossbeam-utils",
+ "libc",
+ "once_cell",
+ "raw-cpuid",
+ "wasi",
+ "web-sys",
+ "winapi",
+]
+
 [[package]]
 name = "quinn"
 version = "0.11.9"
@@ -2001,6 +2125,33 @@ version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c8d0fd677905edcbeedbf2edb6494d676f0e98d54d5cf9bda0b061cb8fb8aba"
 
+[[package]]
+name = "rand_xoshiro"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f703f4665700daf5512dcca5f43afa6af89f09db47fb56be587f80636bda2d41"
+dependencies = [
+ "rand_core 0.9.5",
+]
+
+[[package]]
+name = "rapidhash"
+version = "4.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5da7e78a036ce858e8d55b7e7dc8ba3a88b78350fd2155d3591bbd966b58589e"
+dependencies = [
+ "rustversion",
+]
+
+[[package]]
+name = "raw-cpuid"
+version = "11.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "498cd0dc59d73224351ee52a95fee0f1a617a2eae0e7d9d720cc622c73a54186"
+dependencies = [
+ "bitflags 2.11.0",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -2220,6 +2371,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "scoped-tls"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -2373,6 +2530,12 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2aa850e253778c88a04c3d7323b043aeda9d3e30d5971937c1855769763678e"
 
+[[package]]
+name = "sketches-ddsketch"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c6f73aeb92d671e0cc4dca167e59b2deb6387c375391bc99ee743f326994a2b"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -3274,6 +3437,22 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
 [[package]]
 name = "winapi-util"
 version = "0.1.11"
@@ -3283,6 +3462,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"