enhancement(metrics): add support for scoped (local) recorders

.github/workflows/ci.yml

@@ -11,8 +11,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Install Rust Nightly
-      run: rustup default nightly
+    - name: Install rustfmt
+      run: rustup component add rustfmt
     - name: Check Formatting
       run: cargo fmt --all -- --check
   feature-check:
@@ -30,19 +30,30 @@ jobs:
     - name: Check Feature Matrix
       run: cargo hack check --all --all-targets --feature-powerset --release
   test:
+    name: Test (rust-toolchain.toml)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install Protobuf Compiler
+      run: sudo apt-get install protobuf-compiler
+    - name: Install Rust Stable
+      run: rustup default stable
+    - name: Run Tests
+      run: cargo test --all-features --workspace
+  test-matrixed:
     name: Test ${{ matrix.rust_version }}
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust_version: ['1.61.0', 'stable', 'nightly']
+        rust_version: ['stable', 'nightly']
     steps:
     - uses: actions/checkout@v3
     - name: Install Protobuf Compiler
       run: sudo apt-get install protobuf-compiler
     - name: Install Rust ${{ matrix.rust_version }}
-      run: rustup default ${{ matrix.rust_version }}
+      run: rustup install ${{ matrix.rust_version }}
     - name: Run Tests
-      run: cargo test --all-features --workspace --exclude=metrics-observer -- --test-threads=1
+      run: cargo +${{ matrix.rust_version }} test --all-features --workspace
   docs:
     runs-on: ubuntu-latest
     env:
@@ -52,9 +63,9 @@ jobs:
     - name: Install Protobuf Compiler
       run: sudo apt-get install protobuf-compiler
     - name: Install Rust Nightly
-      run: rustup default nightly
+      run: rustup install nightly
     - name: Check Docs
-      run: cargo doc --all-features --workspace --exclude=metrics-observer --no-deps
+      run: cargo +nightly doc --all-features --workspace --no-deps
   bench:
     name: Bench
     runs-on: ubuntu-latest
@@ -65,18 +76,17 @@ jobs:
     - name: Install Rust Stable
       run: rustup default stable
     - name: Run Benchmarks
-      run: cargo bench --all-features --workspace --exclude=metrics-observer
+      run: cargo bench --all-features --workspace --exclude=metrics-observer --exclude=metrics-benchmark
   clippy:
-    name: Clippy ${{ matrix.rust_version }}
+    name: Clippy
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        rust_version: ['1.61.0', 'stable', 'nightly']
     steps:
     - uses: actions/checkout@v3
     - name: Install Protobuf Compiler
       run: sudo apt-get install protobuf-compiler
-    - name: Install Rust ${{ matrix.rust_version }}
-      run: rustup default ${{ matrix.rust_version }}
+    - name: Install Rust Stable
+      run: rustup default stable
+    - name: Install Clippy
+      run: rustup component add clippy
     - name: Run Clippy
-      run: cargo clippy --all-features --workspace --exclude=metrics-observer
+      run: cargo clippy --all-features --workspace --exclude=metrics-benchmark

README.md

@@ -65,7 +65,7 @@ As well, there are also some community-maintained exporters and other integratio
 
 ## MSRV and MSRV policy
 
-Minimum supported Rust version (MSRV) is currently **1.61.0**, enforced by CI.
+Minimum supported Rust version (MSRV) is currently **1.65.0**, enforced by CI.
 
 `metrics` will always support _at least_ the latest four versions of stable Rust, based on minor
 version releases, and excluding patch versions. Overall, we strive to support older versions where

metrics-benchmark/Cargo.toml

@@ -3,7 +3,7 @@ name = "metrics-benchmark"
 version = "0.1.1-alpha.5"
 authors = ["Toby Lawrence <[email protected]>"]
 edition = "2018"
-rust-version = "1.61.0"
+rust-version = "1.65.0"
 publish = false
 
 [dependencies]

metrics-benchmark/src/main.rs

@@ -3,7 +3,7 @@ use hdrhistogram::Histogram as HdrHistogram;
 use log::{error, info};
 use metrics::{
     counter, gauge, histogram, Counter, Gauge, Histogram, Key, KeyName, Metadata, Recorder,
-    SharedString, Unit,
+    SetRecorderError, SharedString, Unit,
 };
 use metrics_util::registry::{AtomicStorage, Registry};
 use portable_atomic::AtomicU64;
@@ -56,8 +56,8 @@ impl BenchmarkingRecorder {
     }
 
     /// Installs this recorder as the global recorder.
-    pub fn install(self) -> Result<(), metrics::SetRecorderError> {
-        metrics::set_boxed_recorder(Box::new(self))
+    pub fn install(self) -> Result<(), SetRecorderError<Self>> {
+        metrics::set_global_recorder(self)
     }
 }
 

metrics-exporter-prometheus/CHANGELOG.md

@@ -10,7 +10,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Support for using HTTPS in Push Gateway mode. ([#392](https://github.com/metrics-rs/metrics/pull/392))
+- Support for using HTTPS in Push Gateway mode.
+  ([#392](https://github.com/metrics-rs/metrics/pull/392))
+
+### Changed
+
+- Bump MSRV to 1.65.0.
 
 ## [0.12.2] - 2023-12-13
 

metrics-exporter-prometheus/Cargo.toml

@@ -3,7 +3,7 @@ name = "metrics-exporter-prometheus"
 version = "0.12.2"
 authors = ["Toby Lawrence <[email protected]>"]
 edition = "2018"
-rust-version = "1.61.0"
+rust-version = "1.65.0"
 
 license = "MIT"
 

metrics-exporter-prometheus/src/builder.rs

@@ -367,7 +367,7 @@ impl PrometheusBuilder {
             recorder
         };
 
-        metrics::set_boxed_recorder(Box::new(recorder))?;
+        metrics::set_global_recorder(recorder)?;
 
         Ok(())
     }
@@ -384,7 +384,7 @@ impl PrometheusBuilder {
         let recorder = self.build_recorder();
         let handle = recorder.handle();
 
-        metrics::set_boxed_recorder(Box::new(recorder))?;
+        metrics::set_global_recorder(recorder)?;
 
         Ok(handle)
     }
@@ -560,9 +560,9 @@ fn basic_auth(username: &str, password: Option<&str>) -> HeaderValue {
     let mut buf = b"Basic ".to_vec();
     {
         let mut encoder = EncoderWriter::new(&mut buf, &BASE64_STANDARD);
-        let _ = write!(encoder, "{username}:");
+        write!(encoder, "{username}:").expect("should not fail to encode username");
         if let Some(password) = password {
-            let _ = write!(encoder, "{password}");
+            write!(encoder, "{password}").expect("should not fail to encode password");
         }
     }
     let mut header = HeaderValue::from_bytes(&buf).expect("base64 is always valid HeaderValue");

metrics-exporter-prometheus/src/common.rs

@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use crate::distribution::Distribution;
+use crate::{distribution::Distribution, PrometheusRecorder};
 
 use crate::formatting::sanitize_metric_name;
 use indexmap::IndexMap;
@@ -54,7 +54,7 @@ pub enum BuildError {
 
     /// Installing the recorder did not succeed.
     #[error("failed to install exporter as global recorder: {0}")]
-    FailedToSetGlobalRecorder(#[from] SetRecorderError),
+    FailedToSetGlobalRecorder(#[from] SetRecorderError<PrometheusRecorder>),
 
     /// The given address could not be parsed successfully as an IP address/subnet.
     #[error("failed to parse address as a valid IP address/subnet: {0}")]

metrics-exporter-prometheus/src/recorder.rs

@@ -198,9 +198,6 @@ impl Inner {
 
 /// A Prometheus recorder.
 ///
-/// This recorder should be composed with other recorders or installed globally via
-/// [`metrics::set_boxed_recorder`].
-///
 /// Most users will not need to interact directly with the recorder, and can simply deal with the
 /// builder methods on [`PrometheusBuilder`](crate::PrometheusBuilder) for building and installing
 /// the recorder/exporter.

metrics-exporter-tcp/CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - ReleaseDate
 
+### Changed
+
+- Bump MSRV to 1.65.0.
+
 ## [0.8.0] - 2023-04-16
 
 ### Changed

metrics-exporter-tcp/Cargo.toml

@@ -3,7 +3,7 @@ name = "metrics-exporter-tcp"
 version = "0.8.0"
 authors = ["Toby Lawrence <[email protected]>"]
 edition = "2018"
-rust-version = "1.61.0"
+rust-version = "1.65.0"
 
 license = "MIT"
 
@@ -27,6 +27,7 @@ tracing = { version = "0.1", default-features = false, features = ["attributes"]
 
 [build-dependencies]
 prost-build = "0.11"
+home = "=0.5.5"
 
 [dev-dependencies]
 quanta = "0.12"

metrics-exporter-tcp/src/lib.rs

@@ -104,7 +104,7 @@ pub enum Error {
     Io(io::Error),
 
     /// Installing the recorder did not succeed.
-    Recorder(SetRecorderError),
+    Recorder(SetRecorderError<TcpRecorder>),
 }
 
 impl From<io::Error> for Error {
@@ -113,8 +113,8 @@ impl From<io::Error> for Error {
     }
 }
 
-impl From<SetRecorderError> for Error {
-    fn from(e: SetRecorderError) -> Self {
+impl From<SetRecorderError<TcpRecorder>> for Error {
+    fn from(e: SetRecorderError<TcpRecorder>) -> Self {
         Error::Recorder(e)
     }
 }
@@ -284,8 +284,7 @@ impl TcpBuilder {
     /// installing the recorder as the global recorder.
     pub fn install(self) -> Result<(), Error> {
         let recorder = self.build()?;
-        metrics::set_boxed_recorder(Box::new(recorder))?;
-        Ok(())
+        metrics::set_global_recorder(recorder).map_err(Into::into)
     }
 
     /// Builds and installs the exporter, but returns the recorder.

metrics-observer/CHANGELOG.md

@@ -14,6 +14,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   order, instead of only trying the first and then giving up.
   ([#429](https://github.com/metrics-rs/metrics/pull/429))
 
+### Changed
+
+- Bump MSRV to 1.65.0.
+
 ## [0.2.0] - 2023-04-16
 
 ### Added

metrics-observer/Cargo.toml

@@ -3,7 +3,7 @@ name = "metrics-observer"
 version = "0.2.0"
 authors = ["Toby Lawrence <[email protected]>"]
 edition = "2018"
-rust-version = "1.61.0"
+rust-version = "1.65.0"
 
 license = "MIT"
 
@@ -29,3 +29,4 @@ chrono = { version = "0.4", default-features = false, features = ["clock"] }
 
 [build-dependencies]
 prost-build = "0.11"
+home = "=0.5.5"

metrics-tracing-context/CHANGELOG.md

@@ -10,7 +10,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Support for dynamism using `tracing::Span::record` to add label values. ([#408](https://github.com/metrics-rs/metrics/pull/408))
+- Support for dynamism using `tracing::Span::record` to add label values.
+  ([#408](https://github.com/metrics-rs/metrics/pull/408))
+
+### Changed
+
+- Bump MSRV to 1.65.0.
 
 ## [0.14.0] - 2023-04-16
 

metrics-tracing-context/Cargo.toml

@@ -3,7 +3,7 @@ name = "metrics-tracing-context"
 version = "0.14.0"
 authors = ["MOZGIII <[email protected]>"]
 edition = "2018"
-rust-version = "1.61.0"
+rust-version = "1.65.0"
 
 license = "MIT"
 

metrics-tracing-context/src/lib.rs

@@ -23,7 +23,7 @@
 //! // Prepare metrics.
 //! # let my_recorder = DebuggingRecorder::new();
 //! let recorder = TracingContextLayer::all().layer(my_recorder);
-//! metrics::set_boxed_recorder(Box::new(recorder)).unwrap();
+//! metrics::set_global_recorder(recorder).unwrap();
 //! ```
 //!
 //! Then emit some metrics within spans and see the labels being injected!
@@ -37,7 +37,7 @@
 //! # tracing::subscriber::set_global_default(subscriber).unwrap();
 //! # let myrecorder = DebuggingRecorder::new();
 //! # let recorder = TracingContextLayer::all().layer(myrecorder);
-//! # metrics::set_boxed_recorder(Box::new(recorder)).unwrap();
+//! # metrics::set_global_recorder(recorder).unwrap();
 //! use tracing::{span, Level};
 //! use metrics::counter;
 //!