add metric

crates/obs/src/metrics/entry/mod.rs

@@ -0,0 +1,32 @@
+use crate::metrics::{MetricDescriptor, MetricName, MetricType};
+
+pub(crate) mod description;
+pub(crate) mod descriptor;
+pub(crate) mod metric_name;
+pub(crate) mod metric_type;
+pub(crate) mod namespace;
+pub(crate) mod subsystem;
+
+/// Represents a range label constant
+pub const RANGE_LABEL: &str = "range";
+pub const SERVER_NAME: &str = "server";
+
+/// Create a new counter metric descriptor
+pub fn new_counter_md(name: impl Into<MetricName>, help: impl Into<String>, labels: &[&str]) -> MetricDescriptor {
+    MetricDescriptor::new(
+        name.into(),
+        MetricType::Counter,
+        help.into(),
+        labels.iter().map(|&s| s.to_string()).collect(),
+    )
+}
+
+/// Create a new gauge metric descriptor
+pub fn new_gauge_md(name: impl Into<MetricName>, help: impl Into<String>, labels: &[&str]) -> MetricDescriptor {
+    MetricDescriptor::new(
+        name.into(),
+        MetricType::Gauge,
+        help.into(),
+        labels.iter().map(|&s| s.to_string()).collect(),
+    )
+}