diff --git a/Cargo.lock b/Cargo.lock
index a289e0e..9413c42 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,6 +73,17 @@ dependencies = [
  "derive_arbitrary",
 ]
 
+[[package]]
+name = "async-trait"
+version = "0.1.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "644dd749086bf3771a2fbc5f256fdb982d53f011c7d5d560304eafeecebce79d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.98",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -165,6 +176,41 @@ dependencies = [
  "syn 2.0.98",
 ]
 
+[[package]]
+name = "axum-otel-metrics"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e5c40e35dba9c7ce25a6ca0baf5e66bed2612fc92f7b7acfee7611121d9219a"
+dependencies = [
+ "axum",
+ "futures-util",
+ "http",
+ "http-body",
+ "opentelemetry",
+ "opentelemetry-semantic-conventions",
+ "opentelemetry_sdk",
+ "pin-project-lite",
+ "tower",
+]
+
+[[package]]
+name = "axum-tracing-opentelemetry"
+version = "0.26.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "248d7a5925bf89cc9997882d3d0768061477c9b5998959fcebaa5bf8ba4d50dc"
+dependencies = [
+ "axum",
+ "futures-core",
+ "futures-util",
+ "http",
+ "opentelemetry",
+ "pin-project-lite",
+ "tower",
+ "tracing",
+ "tracing-opentelemetry",
+ "tracing-opentelemetry-instrumentation-sdk",
+]
+
 [[package]]
 name = "backtrace"
 version = "0.3.71"
@@ -227,12 +273,11 @@ checksum = "f61dac84819c6588b558454b194026eb1f09c293b9036ae9b159e74e73ab6cf9"
 
 [[package]]
 name = "bzip2"
-version = "0.4.4"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bdb116a6ef3f6c3698828873ad02c3014b3c85cadb88496095628e3ef1e347f8"
+checksum = "75b89e7c29231c673a61a46e722602bcd138298f6b9e81e71119693534585f5c"
 dependencies = [
  "bzip2-sys",
- "libc",
 ]
 
 [[package]]
@@ -271,9 +316,9 @@ checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
 [[package]]
 name = "chrono"
-version = "0.4.39"
+version = "0.4.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e36cc9d416881d2e24f9a963be5fb1cd90966419ac844274161d10488b3e825"
+checksum = "1a7964611d71df112cb1730f2ee67324fcf4d0fc6606acbbe9bfe06df124637c"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
@@ -281,7 +326,7 @@ dependencies = [
  "num-traits",
  "serde",
  "wasm-bindgen",
- "windows-targets",
+ "windows-link",
 ]
 
 [[package]]
@@ -576,9 +621,9 @@ checksum = "92773504d58c093f6de2459af4af33faa518c13451eb8f2b5698ed3d36e7c813"
 
 [[package]]
 name = "either"
-version = "1.13.0"
+version = "1.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+checksum = "b7914353092ddf589ad78f25c5c1c21b7f80b0ff8621e7c814c3485b5306da9d"
 
 [[package]]
 name = "encoding_rs"
@@ -645,9 +690,9 @@ dependencies = [
 
 [[package]]
 name = "flate2"
-version = "1.0.35"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c936bfdafb507ebbf50b8074c54fa31c5be9a1e7e5f467dd659697041407d07c"
+checksum = "11faaf5a5236997af9848be0bef4db95824b1d534ebc64d0f0c6cf3e67bd38dc"
 dependencies = [
  "crc32fast",
  "miniz_oxide 0.8.5",
@@ -708,12 +753,34 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
 
+[[package]]
+name = "futures-executor"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e28d1d997f585e54aebc3f97d39e72338912123a67330d723fdbb564d646c9f"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-io"
 version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e5c1b78ca4aae1ac06c48a526a655760685149f0d465d21f37abfe57ce075c6"
 
+[[package]]
+name = "futures-macro"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.98",
+]
+
 [[package]]
 name = "futures-sink"
 version = "0.3.31"
@@ -734,6 +801,7 @@ checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
 dependencies = [
  "futures-core",
  "futures-io",
+ "futures-macro",
  "futures-sink",
  "futures-task",
  "memchr",
@@ -781,6 +849,12 @@ version = "0.28.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
 
+[[package]]
+name = "glob"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8d1add55171497b4705a648c6b583acafb01d58050a51727785f0b2c8e0a2b2"
+
 [[package]]
 name = "h2"
 version = "0.4.8"
@@ -1225,6 +1299,15 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7655c9839580ee829dfacba1d1278c2b7883e50a277ff7541299489d6bdfdc45"
 
+[[package]]
+name = "itertools"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.14"
@@ -1278,9 +1361,9 @@ checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "libc"
-version = "0.2.169"
+version = "0.2.170"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
+checksum = "875b3680cb2f8f71bdcf9a30f38d48282f5d3c95cbf9b3fa57269bb5d5c06828"
 
 [[package]]
 name = "libredox"
@@ -1301,9 +1384,9 @@ checksum = "d26c52dbd32dccf2d10cac7725f8eae5296885fb5703b261f7d0a0739ec807ab"
 
 [[package]]
 name = "litemap"
-version = "0.7.4"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ee93343901ab17bd981295f2cf0026d4ad018c7c31ba84549a4ddbb47a45104"
+checksum = "23fb14cb19457329c82206317a5663005a4d404783dc74f4252769b0d5f42856"
 
 [[package]]
 name = "lock_api"
@@ -1543,6 +1626,104 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "opentelemetry"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "236e667b670a5cdf90c258f5a55794ec5ac5027e960c224bff8367a59e1e6426"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+ "js-sys",
+ "pin-project-lite",
+ "thiserror 2.0.11",
+ "tracing",
+]
+
+[[package]]
+name = "opentelemetry-http"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8863faf2910030d139fb48715ad5ff2f35029fc5f244f6d5f689ddcf4d26253"
+dependencies = [
+ "async-trait",
+ "bytes",
+ "http",
+ "opentelemetry",
+ "reqwest",
+ "tracing",
+]
+
+[[package]]
+name = "opentelemetry-otlp"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5bef114c6d41bea83d6dc60eb41720eedd0261a67af57b66dd2b84ac46c01d91"
+dependencies = [
+ "async-trait",
+ "futures-core",
+ "http",
+ "opentelemetry",
+ "opentelemetry-http",
+ "opentelemetry-proto",
+ "opentelemetry_sdk",
+ "prost",
+ "reqwest",
+ "thiserror 2.0.11",
+ "tracing",
+]
+
+[[package]]
+name = "opentelemetry-prometheus"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "765a76ba13ec77043903322f85dc5434d7d01a37e75536d0f871ed7b9b5bbf0d"
+dependencies = [
+ "once_cell",
+ "opentelemetry",
+ "opentelemetry_sdk",
+ "prometheus",
+ "protobuf",
+ "tracing",
+]
+
+[[package]]
+name = "opentelemetry-proto"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56f8870d3024727e99212eb3bb1762ec16e255e3e6f58eeb3dc8db1aa226746d"
+dependencies = [
+ "opentelemetry",
+ "opentelemetry_sdk",
+ "prost",
+ "tonic",
+]
+
+[[package]]
+name = "opentelemetry-semantic-conventions"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fb3a2f78c2d55362cd6c313b8abedfbc0142ab3c2676822068fd2ab7d51f9b7"
+
+[[package]]
+name = "opentelemetry_sdk"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84dfad6042089c7fc1f6118b7040dc2eb4ab520abbf410b79dc481032af39570"
+dependencies = [
+ "async-trait",
+ "futures-channel",
+ "futures-executor",
+ "futures-util",
+ "glob",
+ "opentelemetry",
+ "percent-encoding",
+ "rand 0.8.5",
+ "serde_json",
+ "thiserror 2.0.11",
+ "tracing",
+]
+
 [[package]]
 name = "os_str_bytes"
 version = "6.6.1"
@@ -1603,6 +1784,26 @@ version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 
+[[package]]
+name = "pin-project"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfe2e71e1471fe07709406bf725f710b02927c9c54b2b5b2ec0e8087d97c327d"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6e859e6e5bd50440ab63c47e3ebabc90f26251f7c73c3d3e837b74a1cc3fa67"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.98",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.16"
@@ -1709,6 +1910,29 @@ dependencies = [
  "thiserror 1.0.69",
 ]
 
+[[package]]
+name = "prost"
+version = "0.13.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2796faa41db3ec313a31f7624d9286acf277b52de526150b7e69f3debf891ee5"
+dependencies = [
+ "bytes",
+ "prost-derive",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.13.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a56d757972c98b346a9b766e3f02746cde6dd1cd1d1d563472929fdd74bec4d"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.98",
+]
+
 [[package]]
 name = "protobuf"
 version = "2.28.0"
@@ -1742,7 +1966,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3779b94aeb87e8bd4e834cee3650289ee9e0d5677f976ecdb6d219e5f4f6cd94"
 dependencies = [
  "rand_chacha 0.9.0",
- "rand_core 0.9.1",
+ "rand_core 0.9.2",
  "zerocopy 0.8.20",
 ]
 
@@ -1763,7 +1987,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.9.1",
+ "rand_core 0.9.2",
 ]
 
 [[package]]
@@ -1777,9 +2001,9 @@ dependencies = [
 
 [[package]]
 name = "rand_core"
-version = "0.9.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a88e0da7a2c97baa202165137c158d0a2e824ac465d13d81046727b34cb247d3"
+checksum = "7a509b1a2ffbe92afab0e55c8fd99dea1c280e8171bd2d88682bb20bc41cbc2c"
 dependencies = [
  "getrandom 0.3.1",
  "zerocopy 0.8.20",
@@ -1896,9 +2120,9 @@ dependencies = [
 
 [[package]]
 name = "ring"
-version = "0.17.10"
+version = "0.17.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d34b5020fcdea098ef7d95e9f89ec15952123a4a039badd09fabebe9e963e839"
+checksum = "da5349ae27d3887ca812fb375b45a4fbb36d8d12d2df394968cd86e35683fe73"
 dependencies = [
  "cc",
  "cfg-if",
@@ -2017,6 +2241,8 @@ version = "0.4.1-dev"
 dependencies = [
  "anyhow",
  "axum",
+ "axum-otel-metrics",
+ "axum-tracing-opentelemetry",
  "base64",
  "chrono",
  "cross",
@@ -2025,6 +2251,10 @@ dependencies = [
  "faster-hex",
  "indexmap 2.7.1",
  "notify",
+ "opentelemetry",
+ "opentelemetry-otlp",
+ "opentelemetry-prometheus",
+ "opentelemetry_sdk",
  "prometheus",
  "rand 0.9.0",
  "reqwest",
@@ -2038,6 +2268,7 @@ dependencies = [
  "tower-http",
  "tracing",
  "tracing-appender",
+ "tracing-opentelemetry",
  "tracing-panic",
  "tracing-subscriber",
  "uuid",
@@ -2484,6 +2715,17 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eca58d7bba4a75707817a2c44174253f9236b2d5fbd055602e9d5c07c139a047"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "tokio-tungstenite"
 version = "0.26.2"
@@ -2552,6 +2794,27 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "tonic"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877c5b330756d856ffcc4553ab34a5684481ade925ecc54bcd1bf02b1d0d4d52"
+dependencies = [
+ "async-trait",
+ "base64",
+ "bytes",
+ "http",
+ "http-body",
+ "http-body-util",
+ "percent-encoding",
+ "pin-project",
+ "prost",
+ "tokio-stream",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
 [[package]]
 name = "tower"
 version = "0.5.2"
@@ -2652,6 +2915,36 @@ dependencies = [
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-opentelemetry"
+version = "0.29.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "721f2d2569dce9f3dfbbddee5906941e953bfcdf736a62da3377f5751650cc36"
+dependencies = [
+ "js-sys",
+ "once_cell",
+ "opentelemetry",
+ "opentelemetry_sdk",
+ "smallvec",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
+ "tracing-subscriber",
+ "web-time",
+]
+
+[[package]]
+name = "tracing-opentelemetry-instrumentation-sdk"
+version = "0.26.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cae2c7a01582abc7b0a4672f92c47411b69cd3967b8b79bb743d5d0991c9089"
+dependencies = [
+ "http",
+ "opentelemetry",
+ "tracing",
+ "tracing-opentelemetry",
+]
+
 [[package]]
 name = "tracing-panic"
 version = "0.1.2"
@@ -2753,9 +3046,9 @@ checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
 
 [[package]]
 name = "uuid"
-version = "1.14.0"
+version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93d59ca99a559661b96bf898d8fce28ed87935fd2bea9f05983c1464dd6c71b1"
+checksum = "e0f540e3240398cce6128b64ba83fdbdd86129c16a3aa1a3a252efd66eb3d587"
 dependencies = [
  "serde",
 ]
@@ -2893,6 +3186,16 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "web-time"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a6580f308b1fad9207618087a65c04e7a10bc77e02c8e84e9b00dd4b12fa0bb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "which"
 version = "4.4.2"
@@ -2945,6 +3248,12 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "windows-link"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6dccfd733ce2b1753b03b6d3c65edf020262ea35e20ccdf3e288043e6dd620e3"
+
 [[package]]
 name = "windows-registry"
 version = "0.2.0"
@@ -3154,18 +3463,18 @@ dependencies = [
 
 [[package]]
 name = "zerofrom"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cff3ee08c995dee1859d998dea82f7374f2826091dd9cd47def953cae446cd2e"
+checksum = "50cc42e0333e05660c3587f3bf9d0478688e15d870fab3346451ce7f8c9fbea5"
 dependencies = [
  "zerofrom-derive",
 ]
 
 [[package]]
 name = "zerofrom-derive"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "595eed982f7d355beb85837f651fa22e90b3c044842dc7f2c2842c086f295808"
+checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3217,9 +3526,9 @@ dependencies = [
 
 [[package]]
 name = "zip"
-version = "2.2.2"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae9c1ea7b3a5e1f4b922ff856a129881167511563dc219869afe3787fc0c1a45"
+checksum = "b280484c454e74e5fff658bbf7df8fdbe7a07c6b2de4a53def232c15ef138f3a"
 dependencies = [
  "aes",
  "arbitrary",
diff --git a/Cargo.toml b/Cargo.toml
index 002be6f..25c36ed 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,6 +42,13 @@ axum = { version = "0.8", features = ["ws", "macros", "http2"] }
 tower-http = { version = "0.6", features = ["trace"] }
 tokio = { version = "1.41", features = ["full"] }
 prometheus = { version = "0.13.4", features = ["process"] }
+axum-otel-metrics = "0.10.0"
+opentelemetry = "0.28.0"
+opentelemetry_sdk = "0.28.0"
+opentelemetry-otlp = "0.28.0"
+opentelemetry-prometheus = "0.28.0"
+axum-tracing-opentelemetry = "0.26.1"
+tracing-opentelemetry = "0.29.0"
 
 [dev-dependencies]
 cross = "0.2.5"
diff --git a/src/main.rs b/src/main.rs
index e254790..8ede161 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,7 +3,12 @@ use anyhow::Result;
 use axum::{
     extract::DefaultBodyLimit, routing::{delete, get, post, put}, Router
 };
+use axum_otel_metrics::HttpMetricsLayerBuilder;
+use axum_tracing_opentelemetry::middleware::{OtelAxumLayer, OtelInResponseLayer};
 use dashmap::DashMap;
+use opentelemetry::{global, trace::TracerProvider};
+use opentelemetry_sdk::trace::SdkTracerProvider;
+use tracing_opentelemetry::OpenTelemetryLayer;
 use tracing_panic::panic_hook;
 use tracing_subscriber::{fmt::{self, time::ChronoLocal}, layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
 use std::{env::var, path::PathBuf, sync::{Arc, LazyLock}};
@@ -62,6 +67,34 @@ async fn main() -> Result<()> {
     let file_appender = tracing_appender::rolling::never(&*LOGS_VAR, get_log_file(&LOGS_VAR));
     let timer = ChronoLocal::new(String::from("%Y-%m-%dT%H:%M:%S%.3f%:z"));
 
+    // FIXME: METRICS
+    let exporter = opentelemetry_prometheus::exporter()
+        .with_registry(prometheus::default_registry().clone())
+        .build()
+        .unwrap();
+
+    let provider = opentelemetry_sdk::metrics::SdkMeterProvider::builder()
+        .with_reader(exporter)
+        .build();
+
+    // TODO: ensure defer run `provider.shutdown()?;`
+
+    global::set_meter_provider(provider.clone());
+    // FIXME: EOF
+    // FIXME: TRACING
+    let exporter = opentelemetry_otlp::SpanExporter::builder()
+        .with_http()
+        .build()
+        .unwrap();
+
+    let trace_provider = SdkTracerProvider::builder()
+        .with_batch_exporter(exporter)
+        .build();
+
+    // global::set_tracer_provider(trace_provider.clone());
+    let tracer = trace_provider.tracer("tracing-otel-subscriber");
+    // FIXME: EOF
+
     let file_layer = fmt::layer()
         .with_ansi(false) // Disable ANSI colors for file logs
         .with_timer(timer.clone())
@@ -80,6 +113,7 @@ async fn main() -> Result<()> {
         .with(EnvFilter::from(&*LOGGER_VAR))
         .with(file_layer)
         .with(terminal_layer)
+        .with(OpenTelemetryLayer::new(tracer))
         .init();
 
     // std::panic::set_hook(Box::new(panic_hook));
@@ -179,6 +213,9 @@ async fn app() -> Result<bool> {
         ));
     }
 
+    let metrics = HttpMetricsLayerBuilder::new()
+        .build();
+
     let api = Router::new()
         .nest("//auth", api_auth::router()) // => /api//auth ¯\_(ツ)_/¯
         .nest("//assets", api_assets::router())
@@ -196,7 +233,14 @@ async fn app() -> Result<bool> {
         .nest("/api", api)
         .route("/api/", get(check_auth))
         .route("/ws", get(ws))
-        .merge(metrics::metrics_router(config.metrics_enabled))
+        // .merge(metrics::metrics_router(config.metrics_enabled))
+        .route("/metrics", get(|| async {
+            let mut buffer = Vec::new();
+            let encoder = prometheus::TextEncoder::new();
+            prometheus::Encoder::encode(&encoder, &prometheus::gather(), &mut buffer).unwrap();
+            // return metrics
+            String::from_utf8(buffer).unwrap()
+        }))
         .with_state(state) 
         .layer(TraceLayer::new_for_http()
             // .on_request(|request: &axum::http::Request<_>, _span: &tracing::Span| {
@@ -208,7 +252,10 @@ async fn app() -> Result<bool> {
             })
             .on_request(())
         )
-        .layer(axum::middleware::from_fn(track_metrics))
+        .layer(OtelInResponseLayer::default())
+        .layer(OtelAxumLayer::default())
+        .layer(metrics)
+        // .layer(axum::middleware::from_fn(track_metrics))
         .route("/health", get(|| async { "ok" }));
 
     let listener = tokio::net::TcpListener::bind(listen).await?;