memory: convert metrics to use attribute macro (#207)

Converts all memory metrics to use the attribute macro

src/samplers/memory/stats.rs

@@ -1,14 +1,73 @@
 use crate::*;
+use metriken::{metric, Counter, Gauge, LazyCounter, LazyGauge};
 
-gauge!(MEMORY_TOTAL, "memory/total");
-gauge!(MEMORY_FREE, "memory/free");
-gauge!(MEMORY_AVAILABLE, "memory/available");
-gauge!(MEMORY_BUFFERS, "memory/buffers");
-gauge!(MEMORY_CACHED, "memory/cached");
-
-counter!(MEMORY_NUMA_HIT, "memory/numa/hit");
-counter!(MEMORY_NUMA_MISS, "memory/numa/miss");
-counter!(MEMORY_NUMA_FOREIGN, "memory/numa/foreign");
-counter!(MEMORY_NUMA_INTERLEAVE, "memory/numa/interleave");
-counter!(MEMORY_NUMA_LOCAL, "memory/numa/local");
-counter!(MEMORY_NUMA_OTHER, "memory/numa/other");
+#[metric(
+    name = "memory/total",
+    description = "The total amount of system memory",
+    metadata = { unit = "bytes" }
+)]
+pub static MEMORY_TOTAL: LazyGauge = LazyGauge::new(Gauge::default);
+
+#[metric(
+    name = "memory/free",
+    description = "The amount of system memory that is currently free",
+    metadata = { unit = "bytes" }
+)]
+pub static MEMORY_FREE: LazyGauge = LazyGauge::new(Gauge::default);
+
+#[metric(
+    name = "memory/available",
+    description = "The amount of system memory that is available for allocation",
+    metadata = { unit = "bytes" }
+)]
+pub static MEMORY_AVAILABLE: LazyGauge = LazyGauge::new(Gauge::default);
+
+#[metric(
+    name = "memory/buffers",
+    description = "The amount of system memory used for buffers",
+    metadata = { unit = "bytes" }
+)]
+pub static MEMORY_BUFFERS: LazyGauge = LazyGauge::new(Gauge::default);
+
+#[metric(
+    name = "memory/cached",
+    description = "The amount of system memory used by the page cache",
+    metadata = { unit = "bytes" }
+)]
+pub static MEMORY_CACHED: LazyGauge = LazyGauge::new(Gauge::default);
+
+#[metric(
+    name = "memory/numa/hit",
+    description = "The number of allocations that succeeded on the intended node"
+)]
+pub static MEMORY_NUMA_HIT: LazyCounter = LazyCounter::new(Counter::default);
+
+#[metric(
+    name = "memory/numa/miss",
+    description = "The number of allocations that did not succeed on the intended node"
+)]
+pub static MEMORY_NUMA_MISS: LazyCounter = LazyCounter::new(Counter::default);
+
+#[metric(
+    name = "memory/numa/foreign",
+    description = "The number of allocations that were not intended for a node that were serviced by this node"
+)]
+pub static MEMORY_NUMA_FOREIGN: LazyCounter = LazyCounter::new(Counter::default);
+
+#[metric(
+    name = "memory/numa/interleave",
+    description = "The number of interleave policy allocations that succeeded on the intended node"
+)]
+pub static MEMORY_NUMA_INTERLEAVE: LazyCounter = LazyCounter::new(Counter::default);
+
+#[metric(
+    name = "memory/numa/local",
+    description = "The number of allocations that succeeded on the local node"
+)]
+pub static MEMORY_NUMA_LOCAL: LazyCounter = LazyCounter::new(Counter::default);
+
+#[metric(
+    name = "memory/numa/other",
+    description = "The number of allocations that on this node that were allocated by a process on another node"
+)]
+pub static MEMORY_NUMA_OTHER: LazyCounter = LazyCounter::new(Counter::default);