feat: support prometheus-client metrics exporter

.github/workflows/ci.yml

@@ -165,7 +165,7 @@ jobs:
           cargo clippy --all-targets --features tokio-console -- -D warnings
           cargo clippy --all-targets --features deadlock -- -D warnings
           cargo clippy --all-targets --features tracing -- -D warnings
-          cargo clippy --all-targets --features prometheus,opentelemetry_0_26,opentelemetry_0_27 -- -D warnings
+          cargo clippy --all-targets --features prometheus,prometheus-client_0_22,opentelemetry_0_26,opentelemetry_0_27 -- -D warnings
           cargo clippy --all-targets -- -D warnings
       - if: steps.cache.outputs.cache-hit != 'true'
         uses: taiki-e/install-action@cargo-llvm-cov
@@ -182,7 +182,7 @@ jobs:
           RUST_BACKTRACE: 1
           CI: true
         run: |
-          cargo llvm-cov --no-report nextest --features "strict_assertions,sanity,prometheus,opentelemetry_0_26,opentelemetry_0_27"
+          cargo llvm-cov --no-report nextest --features "strict_assertions,sanity,prometheus,prometheus-client_0_22,opentelemetry_0_26,opentelemetry_0_27"
       - name: Run examples with coverage
         env:
           RUST_BACKTRACE: 1

Cargo.toml

@@ -50,6 +50,7 @@ tracing = "0.1"
 prometheus = "0.13"
 opentelemetry_0_27 = { package = "opentelemetry", version = "0.27" }
 opentelemetry_0_26 = { package = "opentelemetry", version = "0.26" }
+prometheus-client_0_22 = { package = "prometheus-client", version = "0.22" }
 
 # foyer components
 foyer-common = { version = "0.13.0-dev", path = "foyer-common" }

Makefile

@@ -10,7 +10,7 @@ check:
 	./scripts/minimize-dashboards.sh
 	cargo sort -w
 	cargo fmt --all
-	cargo clippy --all-targets --features prometheus,opentelemetry_0_26,opentelemetry_0_27
+	cargo clippy --all-targets --features prometheus,prometheus-client_0_22,opentelemetry_0_26,opentelemetry_0_27
 
 check-all:
 	shellcheck ./scripts/*
@@ -21,11 +21,11 @@ check-all:
 	cargo clippy --all-targets --features tokio-console
 	cargo clippy --all-targets --features sanity
 	cargo clippy --all-targets --features tracing
-	cargo clippy --all-targets --features prometheus,opentelemetry_0_26,opentelemetry_0_27
+	cargo clippy --all-targets --features prometheus,prometheus-client_0_22,opentelemetry_0_26,opentelemetry_0_27
 	cargo clippy --all-targets
 
 test:
-	RUST_BACKTRACE=1 cargo nextest run --all --features "strict_assertions,sanity,prometheus,opentelemetry_0_26,opentelemetry_0_27"
+	RUST_BACKTRACE=1 cargo nextest run --all --features "strict_assertions,sanity,prometheus,prometheus-client_0_22,opentelemetry_0_26,opentelemetry_0_27"
 	RUST_BACKTRACE=1 cargo test --doc
 
 test-ignored:

foyer-common/Cargo.toml

@@ -25,6 +25,7 @@ opentelemetry_0_27 = { workspace = true, optional = true }
 parking_lot = { workspace = true }
 pin-project = "1"
 prometheus = { workspace = true, optional = true }
+prometheus-client_0_22 = { workspace = true, optional = true }
 serde = { workspace = true }
 tokio = { workspace = true }
 
@@ -36,6 +37,8 @@ rand = "0.8.5"
 strict_assertions = []
 tracing = ["fastrace/enable"]
 prometheus = ["dep:prometheus"]
+prometheus-client = ["prometheus-client_0_22"]
+prometheus-client_0_22 = ["dep:prometheus-client_0_22"]
 opentelemetry = ["opentelemetry_0_27"]
 opentelemetry_0_27 = ["dep:opentelemetry_0_27"]
 opentelemetry_0_26 = ["dep:opentelemetry_0_26"]

foyer-common/src/metrics/mod.rs

@@ -39,19 +39,19 @@ pub trait HistogramOps: Send + Sync + 'static + Debug {
 /// A vector of counters.
 pub trait CounterVecOps: Send + Sync + 'static + Debug {
     /// Get a counter within the vector of counters.
-    fn counter(&self, labels: &[&str]) -> impl CounterOps;
+    fn counter(&self, labels: &[&'static str]) -> impl CounterOps;
 }
 
 /// A vector of gauges.
 pub trait GaugeVecOps: Send + Sync + 'static + Debug {
     /// Get a gauge within the vector of gauges.
-    fn gauge(&self, labels: &[&str]) -> impl GaugeOps;
+    fn gauge(&self, labels: &[&'static str]) -> impl GaugeOps;
 }
 
 /// A vector of histograms.
 pub trait HistogramVecOps: Send + Sync + 'static + Debug {
     /// Get a histogram within the vector of histograms.
-    fn histogram(&self, labels: &[&str]) -> impl HistogramOps;
+    fn histogram(&self, labels: &[&'static str]) -> impl HistogramOps;
 }
 
 /// Metrics registry.

foyer-common/src/metrics/model.rs

@@ -366,6 +366,20 @@ mod tests {
         case(&PrometheusMetricsRegistry::new(prometheus::Registry::new()));
     }
 
+    #[cfg(feature = "prometheus-client_0_22")]
+    #[test]
+    fn test_metrics_prometheus_client_0_22() {
+        use std::sync::Arc;
+
+        use parking_lot::Mutex;
+
+        use crate::metrics::registry::prometheus_client_0_22::PrometheusClientMetricsRegistry;
+
+        case(&PrometheusClientMetricsRegistry::new(Arc::new(Mutex::new(
+            prometheus_client_0_22::registry::Registry::default(),
+        ))));
+    }
+
     #[cfg(feature = "opentelemetry_0_27")]
     #[test]
     fn test_metrics_opentelemetry_0_27() {

foyer-common/src/metrics/registry/mod.rs

@@ -19,6 +19,14 @@ pub mod noop;
 #[cfg(feature = "prometheus")]
 pub mod prometheus;
 
+/// Prometheus metrics components.
+#[cfg(feature = "prometheus-client")]
+pub use prometheus_client_0_22 as prometheus_client;
+
+/// Prometheus metrics components.
+#[cfg(feature = "prometheus-client_0_22")]
+pub mod prometheus_client_0_22;
+
 #[cfg(feature = "opentelemetry")]
 pub use opentelemetry_0_27 as opentelemetry;
 

foyer-common/src/metrics/registry/noop.rs

@@ -23,7 +23,7 @@ impl CounterOps for NoopMetricsRegistry {
 }
 
 impl CounterVecOps for NoopMetricsRegistry {
-    fn counter(&self, _: &[&str]) -> impl CounterOps {
+    fn counter(&self, _: &[&'static str]) -> impl CounterOps {
         NoopMetricsRegistry
     }
 }
@@ -37,7 +37,7 @@ impl GaugeOps for NoopMetricsRegistry {
 }
 
 impl GaugeVecOps for NoopMetricsRegistry {
-    fn gauge(&self, _: &[&str]) -> impl GaugeOps {
+    fn gauge(&self, _: &[&'static str]) -> impl GaugeOps {
         NoopMetricsRegistry
     }
 }
@@ -47,7 +47,7 @@ impl HistogramOps for NoopMetricsRegistry {
 }
 
 impl HistogramVecOps for NoopMetricsRegistry {
-    fn histogram(&self, _: &[&str]) -> impl HistogramOps {
+    fn histogram(&self, _: &[&'static str]) -> impl HistogramOps {
         NoopMetricsRegistry
     }
 }

foyer-common/src/metrics/registry/opentelemetry_0_26.rs

@@ -84,7 +84,7 @@ pub struct MetricVec {
 }
 
 impl CounterVecOps for MetricVec {
-    fn counter(&self, labels: &[&str]) -> impl CounterOps {
+    fn counter(&self, labels: &[&'static str]) -> impl CounterOps {
         let counter = self.meter.u64_counter(self.name).with_description(self.desc).init();
         let labels = self
             .label_names
@@ -97,7 +97,7 @@ impl CounterVecOps for MetricVec {
 }
 
 impl GaugeVecOps for MetricVec {
-    fn gauge(&self, labels: &[&str]) -> impl GaugeOps {
+    fn gauge(&self, labels: &[&'static str]) -> impl GaugeOps {
         let gauge = self.meter.u64_gauge(self.name).with_description(self.desc).init();
         let labels = self
             .label_names
@@ -111,7 +111,7 @@ impl GaugeVecOps for MetricVec {
 }
 
 impl HistogramVecOps for MetricVec {
-    fn histogram(&self, labels: &[&str]) -> impl HistogramOps {
+    fn histogram(&self, labels: &[&'static str]) -> impl HistogramOps {
         let histogram = self.meter.f64_histogram(self.name).with_description(self.desc).init();
         let labels = self
             .label_names

foyer-common/src/metrics/registry/opentelemetry_0_27.rs

@@ -84,7 +84,7 @@ pub struct MetricVec {
 }
 
 impl CounterVecOps for MetricVec {
-    fn counter(&self, labels: &[&str]) -> impl CounterOps {
+    fn counter(&self, labels: &[&'static str]) -> impl CounterOps {
         let counter = self.meter.u64_counter(self.name).with_description(self.desc).build();
         let labels = self
             .label_names
@@ -97,7 +97,7 @@ impl CounterVecOps for MetricVec {
 }
 
 impl GaugeVecOps for MetricVec {
-    fn gauge(&self, labels: &[&str]) -> impl GaugeOps {
+    fn gauge(&self, labels: &[&'static str]) -> impl GaugeOps {
         let gauge = self.meter.u64_gauge(self.name).with_description(self.desc).build();
         let labels = self
             .label_names
@@ -111,7 +111,7 @@ impl GaugeVecOps for MetricVec {
 }
 
 impl HistogramVecOps for MetricVec {
-    fn histogram(&self, labels: &[&str]) -> impl HistogramOps {
+    fn histogram(&self, labels: &[&'static str]) -> impl HistogramOps {
         let histogram = self.meter.f64_histogram(self.name).with_description(self.desc).build();
         let labels = self
             .label_names

foyer-common/src/metrics/registry/prometheus.rs

@@ -119,7 +119,7 @@ impl CounterOps for IntCounter {
 }
 
 impl CounterVecOps for IntCounterVec {
-    fn counter(&self, labels: &[&str]) -> impl CounterOps {
+    fn counter(&self, labels: &[&'static str]) -> impl CounterOps {
         self.with_label_values(labels)
     }
 }
@@ -139,7 +139,7 @@ impl GaugeOps for IntGauge {
 }
 
 impl GaugeVecOps for IntGaugeVec {
-    fn gauge(&self, labels: &[&str]) -> impl GaugeOps {
+    fn gauge(&self, labels: &[&'static str]) -> impl GaugeOps {
         self.with_label_values(labels)
     }
 }
@@ -151,12 +151,12 @@ impl HistogramOps for Histogram {
 }
 
 impl HistogramVecOps for HistogramVec {
-    fn histogram(&self, labels: &[&str]) -> impl HistogramOps {
+    fn histogram(&self, labels: &[&'static str]) -> impl HistogramOps {
         self.with_label_values(labels)
     }
 }
 
-/// Prometheus metrics registry.
+/// Prometheus metric registry with lib `prometheus`.
 ///
 /// The [`PrometheusMetricsRegistry`] can be cloned and used by multiple foyer instances, without worrying about
 /// duplicately registering.