fix naming consistency

agent/src/collector.rs

@@ -1,13 +1,13 @@
 use common::metrics::{Disk, Memory, Metrics, Network, SystemInfo, CPU};
 use sysinfo::{Disks, Networks, System};
 
-use crate::cpu::CpuStatReader;
+use crate::cpu::CPUStatReader;
 
 pub struct Collector {
     sys: System,
     disks: Disks,
     networks: Networks,
-    cpu_reader: CpuStatReader,
+    cpu_reader: CPUStatReader,
 }
 
 impl Collector {
@@ -16,7 +16,7 @@ impl Collector {
             sys: System::new_all(),
             disks: Disks::new_with_refreshed_list(),
             networks: Networks::new_with_refreshed_list(),
-            cpu_reader: CpuStatReader::new(),
+            cpu_reader: CPUStatReader::new(),
         }
     }