diff --git a/Cargo.lock b/Cargo.lock
index 2872d3b..0c6a8d7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -128,17 +128,6 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
 
-[[package]]
-name = "atty"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-dependencies = [
- "hermit-abi 0.1.19",
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.4.0"
@@ -160,12 +149,6 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
-[[package]]
-name = "base64"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
-
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -420,19 +403,6 @@ dependencies = [
  "regex",
 ]
 
-[[package]]
-name = "env_logger"
-version = "0.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a12e6657c4c97ebab115a42dcee77225f7f482cdd841cf7088c657a42e9e00e7"
-dependencies = [
- "atty",
- "humantime",
- "log",
- "regex",
- "termcolor",
-]
-
 [[package]]
 name = "env_logger"
 version = "0.11.6"
@@ -487,11 +457,13 @@ dependencies = [
  "chrono",
  "clap",
  "dbc-rust-modules",
- "env_logger 0.11.6",
+ "env_logger",
+ "hyper 1.6.0",
+ "hyper-util",
  "lazy_static",
  "num-traits",
  "openssl",
- "prometheus_exporter_base",
+ "prometheus",
  "regex",
  "reqwest 0.12.12",
  "serde",
@@ -654,15 +626,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "hermit-abi"
-version = "0.1.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "hermit-abi"
 version = "0.3.9"
@@ -780,9 +743,9 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "1.4.1"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50dfd22e0e76d0f662d429a5f80fcaf3855009297eab6a0a9f8543834744ba05"
+checksum = "cc2b571658e38e0c01b1fdca3bbbe93c00d3d71693ff2770043f8c29bc7d6f80"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -791,6 +754,7 @@ dependencies = [
  "http 1.1.0",
  "http-body 1.0.1",
  "httparse",
+ "httpdate",
  "itoa",
  "pin-project-lite",
  "smallvec",
@@ -798,21 +762,6 @@ dependencies = [
  "want",
 ]
 
-[[package]]
-name = "hyper-rustls"
-version = "0.23.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1788965e61b367cd03a62950836d5cd41560c3577d90e40e0819373194d1661c"
-dependencies = [
- "http 0.2.12",
- "hyper 0.14.30",
- "log",
- "rustls 0.20.9",
- "rustls-native-certs",
- "tokio",
- "tokio-rustls 0.23.4",
-]
-
 [[package]]
 name = "hyper-rustls"
 version = "0.27.3"
@@ -821,12 +770,12 @@ checksum = "08afdbb5c31130e3034af566421053ab03787c640246a446327f550d11bcb333"
 dependencies = [
  "futures-util",
  "http 1.1.0",
- "hyper 1.4.1",
+ "hyper 1.6.0",
  "hyper-util",
- "rustls 0.23.13",
+ "rustls",
  "rustls-pki-types",
  "tokio",
- "tokio-rustls 0.26.0",
+ "tokio-rustls",
  "tower-service",
  "webpki-roots",
 ]
@@ -852,7 +801,7 @@ checksum = "70206fc6890eaca9fde8a0bf71caa2ddfc9fe045ac9e5c70df101a7dbde866e0"
 dependencies = [
  "bytes",
  "http-body-util",
- "hyper 1.4.1",
+ "hyper 1.6.0",
  "hyper-util",
  "native-tls",
  "tokio",
@@ -862,16 +811,17 @@ dependencies = [
 
 [[package]]
 name = "hyper-util"
-version = "0.1.10"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df2dcfbe0677734ab2f3ffa7fa7bfd4706bfdc1ef393f2ee30184aed67e631b4"
+checksum = "cf9f1e950e0d9d1d3c47184416723cf29c0d1f93bd8cccf37e4beb6b44f31710"
 dependencies = [
  "bytes",
  "futures-channel",
  "futures-util",
  "http 1.1.0",
  "http-body 1.0.1",
- "hyper 1.4.1",
+ "hyper 1.6.0",
+ "libc",
  "pin-project-lite",
  "socket2",
  "tokio",
@@ -1114,9 +1064,9 @@ checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "libc"
-version = "0.2.169"
+version = "0.2.172"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
+checksum = "d750af042f7ef4f724306de029d18836c26c1765a54a6a3f094cbd23a7267ffa"
 
 [[package]]
 name = "linked-hash-map"
@@ -1194,7 +1144,7 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "80e04d1dcff3aae0704555fe5fee3bcfaf3d1fdf8a7e521d5b9d2b42acb52cec"
 dependencies = [
- "hermit-abi 0.3.9",
+ "hermit-abi",
  "libc",
  "wasi 0.11.0+wasi-snapshot-preview1",
  "windows-sys 0.52.0",
@@ -1217,70 +1167,6 @@ dependencies = [
  "tempfile",
 ]
 
-[[package]]
-name = "num"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35bd024e8b2ff75562e5f34e7f4905839deb4b22955ef5e73d2fea1b9813cb23"
-dependencies = [
- "num-bigint",
- "num-complex",
- "num-integer",
- "num-iter",
- "num-rational",
- "num-traits",
-]
-
-[[package]]
-name = "num-bigint"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
-dependencies = [
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-complex"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73f88a1307638156682bada9d7604135552957b7818057dcef22705b4d509495"
-dependencies = [
- "num-traits",
-]
-
-[[package]]
-name = "num-integer"
-version = "0.1.46"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
-dependencies = [
- "num-traits",
-]
-
-[[package]]
-name = "num-iter"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1429034a0490724d0075ebb2bc9e875d6503c3cf69e235a8941aa757d83ef5bf"
-dependencies = [
- "autocfg",
- "num-integer",
- "num-traits",
-]
-
-[[package]]
-name = "num-rational"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
-dependencies = [
- "num-bigint",
- "num-integer",
- "num-traits",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1424,20 +1310,37 @@ dependencies = [
 ]
 
 [[package]]
-name = "prometheus_exporter_base"
-version = "1.4.0"
+name = "prometheus"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e42dafed8b073871c93f6082ff0fc597dbf26fb58974f0140f2c6a46c9f9f624"
+checksum = "3ca5326d8d0b950a9acd87e6a3f94745394f62e4dae1b1ee22b2bc0c394af43a"
+dependencies = [
+ "cfg-if",
+ "fnv",
+ "lazy_static",
+ "memchr",
+ "parking_lot",
+ "protobuf",
+ "thiserror 2.0.11",
+]
+
+[[package]]
+name = "protobuf"
+version = "3.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d65a1d4ddae7d8b5de68153b48f6aa3bba8cb002b243dbdbc55a5afbc98f99f4"
+dependencies = [
+ "once_cell",
+ "protobuf-support",
+ "thiserror 1.0.64",
+]
+
+[[package]]
+name = "protobuf-support"
+version = "3.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e36c2f31e0a47f9280fb347ef5e461ffcd2c52dd520d8e216b52f93b0b0d7d6"
 dependencies = [
- "base64 0.13.1",
- "env_logger 0.9.3",
- "http 0.2.12",
- "hyper 0.14.30",
- "hyper-rustls 0.23.2",
- "log",
- "num",
- "serde",
- "serde_json",
  "thiserror 1.0.64",
 ]
 
@@ -1458,7 +1361,7 @@ dependencies = [
  "quinn-proto",
  "quinn-udp",
  "rustc-hash",
- "rustls 0.23.13",
+ "rustls",
  "socket2",
  "thiserror 2.0.11",
  "tokio",
@@ -1474,9 +1377,9 @@ dependencies = [
  "bytes",
  "getrandom",
  "rand",
- "ring 0.17.8",
+ "ring",
  "rustc-hash",
- "rustls 0.23.13",
+ "rustls",
  "rustls-pki-types",
  "slab",
  "thiserror 2.0.11",
@@ -1632,8 +1535,8 @@ dependencies = [
  "http 1.1.0",
  "http-body 1.0.1",
  "http-body-util",
- "hyper 1.4.1",
- "hyper-rustls 0.27.3",
+ "hyper 1.6.0",
+ "hyper-rustls",
  "hyper-tls 0.6.0",
  "hyper-util",
  "ipnet",
@@ -1645,7 +1548,7 @@ dependencies = [
  "percent-encoding",
  "pin-project-lite",
  "quinn",
- "rustls 0.23.13",
+ "rustls",
  "rustls-pemfile 2.1.3",
  "rustls-pki-types",
  "serde",
@@ -1655,7 +1558,7 @@ dependencies = [
  "system-configuration 0.6.1",
  "tokio",
  "tokio-native-tls",
- "tokio-rustls 0.26.0",
+ "tokio-rustls",
  "tower",
  "tower-service",
  "url",
@@ -1676,21 +1579,6 @@ dependencies = [
  "quick-error",
 ]
 
-[[package]]
-name = "ring"
-version = "0.16.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3053cf52e236a3ed746dfc745aa9cacf1b791d846bdaf412f60a8d7d6e17c8fc"
-dependencies = [
- "cc",
- "libc",
- "once_cell",
- "spin 0.5.2",
- "untrusted 0.7.1",
- "web-sys",
- "winapi",
-]
-
 [[package]]
 name = "ring"
 version = "0.17.8"
@@ -1701,8 +1589,8 @@ dependencies = [
  "cfg-if",
  "getrandom",
  "libc",
- "spin 0.9.8",
- "untrusted 0.9.0",
+ "spin",
+ "untrusted",
  "windows-sys 0.52.0",
 ]
 
@@ -1765,18 +1653,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "rustls"
-version = "0.20.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b80e3dec595989ea8510028f30c408a4630db12c9cbb8de34203b89d6577e99"
-dependencies = [
- "log",
- "ring 0.16.20",
- "sct",
- "webpki",
-]
-
 [[package]]
 name = "rustls"
 version = "0.23.13"
@@ -1784,25 +1660,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2dabaac7466917e566adb06783a81ca48944c6898a1b08b9374106dd671f4c8"
 dependencies = [
  "once_cell",
- "ring 0.17.8",
+ "ring",
  "rustls-pki-types",
  "rustls-webpki",
  "subtle",
  "zeroize",
 ]
 
-[[package]]
-name = "rustls-native-certs"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9aace74cb666635c918e9c12bc0d348266037aa8eb599b5cba565709a8dff00"
-dependencies = [
- "openssl-probe",
- "rustls-pemfile 1.0.4",
- "schannel",
- "security-framework",
-]
-
 [[package]]
 name = "rustls-pemfile"
 version = "1.0.4"
@@ -1837,9 +1701,9 @@ version = "0.102.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "64ca1bc8749bd4cf37b5ce386cc146580777b4e8572c7b97baf22c83f444bee9"
 dependencies = [
- "ring 0.17.8",
+ "ring",
  "rustls-pki-types",
- "untrusted 0.9.0",
+ "untrusted",
 ]
 
 [[package]]
@@ -1872,16 +1736,6 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
-[[package]]
-name = "sct"
-version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da046153aa2352493d6cb7da4b6e5c0c057d8a1d0a9aa8560baffdd945acd414"
-dependencies = [
- "ring 0.17.8",
- "untrusted 0.9.0",
-]
-
 [[package]]
 name = "security-framework"
 version = "2.11.1"
@@ -1981,20 +1835,14 @@ checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 
 [[package]]
 name = "socket2"
-version = "0.5.7"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce305eb0b4296696835b71df73eb912e0f1ffd2556a501fcede6e0c50349191c"
+checksum = "4f5fd57c80058a56cf5c777ab8a126398ece8e442983605d280a44ce79d0edef"
 dependencies = [
  "libc",
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "spin"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
-
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -2140,15 +1988,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "termcolor"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "thiserror"
 version = "1.0.64"
@@ -2264,24 +2103,13 @@ dependencies = [
  "tokio",
 ]
 
-[[package]]
-name = "tokio-rustls"
-version = "0.23.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c43ee83903113e03984cb9e5cebe6c04a5116269e900e3ddba8f068a62adda59"
-dependencies = [
- "rustls 0.20.9",
- "tokio",
- "webpki",
-]
-
 [[package]]
 name = "tokio-rustls"
 version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c7bc40d0e5a97695bb96e27995cd3a08538541b0a846f65bba7a359f36700d4"
 dependencies = [
- "rustls 0.23.13",
+ "rustls",
  "rustls-pki-types",
  "tokio",
 ]
@@ -2437,12 +2265,6 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
 
-[[package]]
-name = "untrusted"
-version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
-
 [[package]]
 name = "untrusted"
 version = "0.9.0"
@@ -2644,16 +2466,6 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "webpki"
-version = "0.22.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed63aea5ce73d0ff405984102c42de94fc55a6b75765d621c65262469b3c9b53"
-dependencies = [
- "ring 0.17.8",
- "untrusted 0.9.0",
-]
-
 [[package]]
 name = "webpki-roots"
 version = "0.26.8"
diff --git a/Cargo.toml b/Cargo.toml
index 8c43980..fb459b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,6 @@ lazy_static = "1"
 walkdir = "2"
 trust-dns-resolver = { version = "0.23", features = ["tokio-runtime"] }
 env_logger = "0.11"
-prometheus_exporter_base = { version = "=1.4.0", features = ["hyper_server"] }
 tokio = { version = "1", features = [ "full" ] }
 async-trait = { version = "0.1" }
 dbc-rust-modules = { git = "https://github.com/dbcdk/rust-modules", branch = "main" }
@@ -26,6 +25,9 @@ url = "2"
 chrono = "0.4"
 num-traits = "0.2"
 reqwest = { version = "0.12", features = ["blocking", "json"] }
+prometheus = "0.14.0"
+hyper = { version = "1.6.0", features = ["server"] }
+hyper-util = "0.1.12"
 
 [profile.release]
 panic = "abort"
diff --git a/nixos/vault-test.nix b/nixos/vault-test.nix
index eb4d6ec..8017fea 100644
--- a/nixos/vault-test.nix
+++ b/nixos/vault-test.nix
@@ -165,5 +165,10 @@ testLib.mkFaytheTest ({ nodes, ... }: {
         client.fail("""
           journalctl -u faythe | grep -q "dispatch task is gone: runtime dropped the dispatch task"
         """)
+
+    with subtest("Has success metrics"):
+        client.succeed("""
+          curl localhost:9105/metrics | grep -q 'faythe_issue_successes{cert="path1-test"} 1'
+        """)
   '';
 })
diff --git a/src/main.rs b/src/main.rs
index 85a3e21..f775abc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,6 +106,11 @@ async fn run(config: &FaytheConfig) {
     }
 
     let metrics_port = config.metrics_port;
-    threads.spawn(metrics::serve(metrics_port));
+
+    threads.spawn(async move {
+        if let Err(e) = metrics::serve(metrics_port).await {
+            eprintln!("Metrics server error: {}", e);
+        }
+    });
     threads.join_all().await;
 }
diff --git a/src/metrics.rs b/src/metrics.rs
index 87b5a3f..4046f9a 100644
--- a/src/metrics.rs
+++ b/src/metrics.rs
@@ -1,12 +1,17 @@
-use prometheus_exporter_base::prelude::*;
-use prometheus_exporter_base::PrometheusInstance;
-use std::collections::HashMap;
-use std::sync::RwLock;
+use std::net::SocketAddr;
 
+use hyper::body::Incoming;
+use hyper::header::CONTENT_TYPE;
+use hyper::server::conn::http1;
+use hyper::service::service_fn;
+use hyper::Request;
+use hyper::Response;
+use hyper_util::rt::TokioIo;
+use lazy_static::lazy_static;
+use prometheus::{Encoder, TextEncoder, IntCounterVec, register_int_counter_vec};
+use tokio::net::TcpListener;
 
-use crate::log;
-#[derive(Debug, Clone, Default)]
-struct MyOptions {}
+type BoxedErr = Box<dyn std::error::Error + Send + Sync + 'static>;
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum MetricsType {
@@ -14,73 +19,54 @@ pub enum MetricsType {
     Failure,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct MetricsEvent {
-    pub cert_name: String,
-    pub event_type: MetricsType,
-}
-
 lazy_static! {
-    static ref EVENTS: RwLock<HashMap<MetricsEvent, u64>> = RwLock::new(HashMap::new());
+    static ref ISSUE_SUCCESS: IntCounterVec = register_int_counter_vec!(
+        "faythe_issue_successes",
+        "Succesfully issued certificates.",
+        &["cert"]
+    )
+    .unwrap();
+    static ref ISSUE_FAILURE: IntCounterVec = register_int_counter_vec!(
+        "faythe_issue_failures",
+        "Failed certificate issue attempts.",
+        &["cert"]
+    )
+    .unwrap();
 }
 
 pub fn new_event(cert_name: &str, event_type: MetricsType) {
-    let event = MetricsEvent {
-        cert_name: cert_name.to_string(),
-        event_type,
-    };
-    let mut guard = EVENTS.write().unwrap();
-    let new_value = match guard.remove(&event) {
-        Some(old_value) => old_value + 1,
-        None => 1,
-    };
-    guard.insert(event, new_value);
+    match event_type {
+        MetricsType::Success => ISSUE_SUCCESS.with_label_values(&[cert_name]).inc(),
+        MetricsType::Failure => ISSUE_FAILURE.with_label_values(&[cert_name]).inc(),
+    }
 }
 
-pub async fn serve(port: u16) {
-    let addr = ServerOptions {
-        addr:   ([0, 0, 0, 0], port).into(),
-        authorization: Authorization::None,
-    };
+async fn serve_req(_req: Request<Incoming>) -> Result<Response<String>, BoxedErr> {
+    let encoder = TextEncoder::new();
 
-    log::info(&format!("starting metrics server on port: {}", port));
+    let metric_families = prometheus::gather();
+    let body = encoder.encode_to_string(&metric_families)?;
 
-    render_prometheus(
-        addr,
-        MyOptions::default(),
-        |_request, _options| async move {
-            let mut successes = PrometheusMetric::build()
-                .with_name("faythe_issue_successes")
-                .with_metric_type(MetricType::Counter)
-                .with_help("Succesfully issued certificates")
-                .build();
+    let response = Response::builder()
+        .status(200)
+        .header(CONTENT_TYPE, encoder.format_type())
+        .body(body)?;
 
-            let mut failures = PrometheusMetric::build()
-                .with_name("faythe_issue_failures")
-                .with_metric_type(MetricType::Counter)
-                .with_help("Failed certificate issue attempts")
-                .build();
+    Ok(response)
+}
 
-            for (event, count) in EVENTS.read().unwrap().iter() {
-                match &event.event_type {
-                    MetricsType::Success => {
-                        successes.render_and_append_instance(
-                            &PrometheusInstance::new()
-                                .with_label("cert", event.cert_name.as_str())
-                                .with_value(*count),
-                        );
-                    }
-                    MetricsType::Failure => {
-                        failures.render_and_append_instance(
-                            &PrometheusInstance::new()
-                                .with_label("cert", event.cert_name.as_str())
-                                .with_value(*count),
-                        );
-                    }
-                }
-            }
-            Ok(format!("{}\n{}", successes.render(), failures.render()))
-        },
-    )
-    .await;
+pub async fn serve(port: u16) -> Result<(), BoxedErr> {
+    let addr: SocketAddr = ([0, 0, 0, 0], port).into();
+    println!("Listening on http://{}", addr);
+    let listener = TcpListener::bind(addr).await?;
+
+    loop {
+        let (stream, _) = listener.accept().await?;
+        let io = TokioIo::new(stream);
+
+        let service = service_fn(serve_req);
+        if let Err(err) = http1::Builder::new().serve_connection(io, service).await {
+            eprintln!("server error: {:?}", err);
+        };
+    }
 }