feat(core): add metrics/observability with prometheus

cmd/ethrex/Cargo.toml

@@ -34,6 +34,7 @@ redb = { workspace = true, optional = true }
 cfg-if = "1.0.0"
 
 ethrex-dev = { path = "../../crates/blockchain/dev", optional = true }
+ethrex-metrics = { path = "../../crates/blockchain/metrics", optional = true }
 
 [[bin]]
 name = "ethrex"
@@ -42,6 +43,7 @@ path = "./ethrex.rs"
 [features]
 default = ["dep:ethrex-storage", "libmdbx"]
 dev = ["dep:ethrex-dev"]
+metrics = ["dep:ethrex-metrics", "ethrex-blockchain/metrics"]
 libmdbx = ["dep:libmdbx", "ethrex-storage/libmdbx"]
 redb = ["dep:redb", "ethrex-storage/redb"]
 l2 = ["ethrex-vm/l2"]

cmd/ethrex/cli.rs

@@ -116,6 +116,12 @@ pub fn cli() -> Command {
                 .required(false)
                 .value_name("BLOCKS_DIR_PATH"),
         )
+        .arg(
+            Arg::new("metrics.port")
+                .long("metrics.port")
+                .required(false)
+                .value_name("PROMETHEUS_METRICS_PORT"),
+        )
         .subcommand(
             Command::new("removedb").about("Remove the database").arg(
                 Arg::new("datadir")

cmd/ethrex/ethrex.rs

@@ -208,6 +208,20 @@ async fn main() {
 
     tracker.spawn(rpc_api);
 
+    // Start the prometheus /metrics api
+    cfg_if::cfg_if! {
+        if #[cfg(feature = "metrics")] {
+            use ethrex_metrics;
+
+            let metrics_port = matches
+                .get_one::<String>("metrics.port")
+                .map_or("3000".to_string(), |v| v.clone());
+
+            let metrics_api = ethrex_metrics::metrics_api::start_prometheus_metrics_api(metrics_port);
+            tracker.spawn(metrics_api);
+        }
+    }
+
     // We do not want to start the networking module if the l2 feature is enabled.
     cfg_if::cfg_if! {
         if #[cfg(feature = "l2")] {

cmd/ethrex_l2/src/commands/test.rs

@@ -72,11 +72,15 @@ async fn transfer_from(
     let client = EthClient::new(&cfg.network.l2_rpc_url);
     let private_key = SecretKey::from_slice(pk.parse::<H256>().unwrap().as_bytes()).unwrap();
 
-    let mut buffer = [0u8; 32];
-    let public_key = private_key.public_key(secp256k1::SECP256K1).serialize();
-    buffer.copy_from_slice(&public_key[1..]);
+    let public_key = private_key
+        .public_key(secp256k1::SECP256K1)
+        .serialize_uncompressed();
+    let hash = keccak(&public_key[1..]);
 
-    let address = H160::from(keccak(buffer));
+    // Get the last 20 bytes of the hash
+    let address_bytes: [u8; 20] = hash.as_ref().get(12..32).unwrap().try_into().unwrap();
+
+    let address = Address::from(address_bytes);
     let nonce = client.get_nonce(address).await.unwrap();
 
     let mut retries = 0;

crates/blockchain/Cargo.toml

@@ -19,6 +19,8 @@ ethrex-vm = { path = "../vm", default-features = false }
 
 k256 = { version = "0.13.3", features = ["ecdh"] }
 
+ethrex-metrics = { path = "./metrics", default-features = false }
+
 [dev-dependencies]
 serde_json.workspace = true
 hex = "0.4.3"
@@ -28,10 +30,7 @@ path = "./blockchain.rs"
 
 [features]
 default = ["c-kzg"]
-libmdbx = [
-    "ethrex-core/libmdbx",
-    "ethrex-storage/default",
-    "ethrex-vm/libmdbx",
-]
+libmdbx = ["ethrex-core/libmdbx", "ethrex-storage/default", "ethrex-vm/libmdbx"]
 levm = ["ethrex-vm/levm"]
-c-kzg =["ethrex-core/c-kzg"]
+c-kzg = ["ethrex-core/c-kzg"]
+metrics = ["ethrex-metrics/api"]

crates/blockchain/dev/Dockerfile

@@ -22,7 +22,7 @@ COPY --from=planner /ethrex/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
 
 COPY . .
-RUN cargo build --release --features dev
+RUN cargo build --release --features "dev,metrics"
 
 FROM ubuntu:24.04
 WORKDIR /usr/local/bin

crates/blockchain/dev/docker-compose-dev.yaml

@@ -1,3 +1,9 @@
+# If this dev container is run in the same machine as the L2 node
+# we have to run this docker-compose with the .overrides file too
+# example: docker compose -f docker-compose-dev.yaml -f docker-compose-metrics-l1.override.yaml up
+include:
+  - ../metrics/docker-compose-metrics.yaml
+
 services:
   ethrex:
     restart: always
@@ -10,4 +16,4 @@ services:
       - 127.0.0.1:8545:8545
     volumes:
       - ../../../test_data/genesis-l1.json:/genesis-l1.json
-    command: --network /genesis-l1.json --http.addr 0.0.0.0 --http.port 8545
+    command: --network /genesis-l1.json --http.addr 0.0.0.0 --http.port 8545 --metrics.port 3701

crates/blockchain/metrics/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "ethrex-metrics"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio.workspace = true
+tracing.workspace = true
+thiserror.workspace = true
+serde_json.workspace = true
+serde.workspace = true
+
+ethrex-core = { path = "../../common", default-features = false }
+
+prometheus = "0.13.4"
+
+# TODO: remove?
+axum = "0.7.9"
+
+
+[lib]
+path = "./mod.rs"
+
+[features]
+default = ["api"]
+api = []

crates/blockchain/metrics/README.md

@@ -0,0 +1,37 @@
+# Metrics
+
+A `docker-compose` is used to bundle prometheus and grafana services, the `*overrides` files define the ports and mounts the prometheus' configuration file.
+If a new dashboard is designed just for the L1 or L2, it can be mounted only in that `*overrides` file.
+
+To run the node with metrics, the next steps should be followed:
+1. Build the `ethrex` binary with the `metrics` feature enabled.
+2. Set the `--metrics.port` cli arg of the ethrex binary to match the port defined in `metrics/provisioning/prometheus/prometheus*.yaml`
+3. Run the docker containers, example with the L2:
+
+```sh
+docker compose -f docker-compose-metrics.yaml -f docker-compose-metrics-l2.override.yaml up
+```
+
+>[!NOTE]
+> The L2's Makefile automatically starts the prometheus and grafana services with `make init`. For the L1 used in dev mode and the L2.
+
+
+- For the L2 we use the following files in conjunction:
+  - `docker-compose-metrics.yaml`
+  - `docker-compose-metrics-l2.overrides.yaml`
+  - The defaults are:
+    - PORT `3702` → metrics API (used by prometheus)
+    - PORT `3802` → Grafana
+      - usr: `admin`
+      - pwd: `admin` 
+    - PORT `9092` → Prometheus
+
+- For the L1 dev we use the following files in conjunction:
+  - `docker-compose-metrics.yaml`
+  - `docker-compose-metrics-l1-dev.overrides.yaml`
+  - The defaults are:
+    - PORT `3701` → metrics API (used by prometheus)
+    - PORT `3801` → Grafana
+      - usr: `admin`
+      - pwd: `admin` 
+    - PORT `9091` → Prometheus

crates/blockchain/metrics/docker-compose-metrics-l1-dev.overrides.yaml

@@ -0,0 +1,9 @@
+services:
+  prometheus:
+    volumes:
+      - ../metrics/provisioning/prometheus/prometheus_l1_dev.yaml:/etc/prometheus/prometheus.yaml
+    ports:
+      - "9091:9090"
+  grafana:
+    ports:
+      - "3801:3000"

crates/blockchain/metrics/docker-compose-metrics-l2.overrides.yaml

@@ -0,0 +1,9 @@
+services:
+  prometheus:
+    volumes:
+      - ../metrics/provisioning/prometheus/prometheus_l2.yaml:/etc/prometheus/prometheus.yaml
+    ports:
+      - "9092:9090"
+  grafana:
+    ports:
+      - "3802:3000"

crates/blockchain/metrics/docker-compose-metrics.yaml

@@ -0,0 +1,15 @@
+# example: docker compose -f docker-compose-metrics.yaml -f docker-compose-metrics-l2.override.yaml up
+services:
+  prometheus:
+    image: prom/prometheus
+    command: --config.file=/etc/prometheus/prometheus.yaml
+    #volumes: defined in the .overrides file
+    #ports: defined in the .overrides file
+  grafana:
+    image: grafana/grafana
+    volumes:
+      - ./provisioning/grafana_provisioning/dashboards:/etc/grafana/provisioning/dashboards
+      - ./provisioning/grafana_provisioning/datasources:/etc/grafana/provisioning/datasources
+    #ports: defined in the .overrides file
+    depends_on:
+      - prometheus