Remove all unused code and fix build warnings

- Remove unused struct fields: tier, config_name, last_collection_time
- Remove unused structs: PerformanceMetrics, PerfMonitor
- Remove unused methods: get_performance_metrics, get_collector_names, get_stats
- Remove unused utility functions and system helpers
- Remove unused config fields from CPU and Memory collectors
- Keep config fields that are actually used (DiskCollector, etc.)
- Remove unused proxy_pass_url variable and assignments
- Fix duplicate hostname variable declaration
- Achieve zero build warnings without functionality changes

agent/src/collectors/cpu.rs

@@ -15,7 +15,6 @@ use crate::config::CpuConfig;
 /// - No process spawning
 /// - <0.1ms collection time target
 pub struct CpuCollector {
-    config: CpuConfig,
     name: String,
     load_thresholds: HysteresisThresholds,
     temperature_thresholds: HysteresisThresholds,
@@ -35,7 +34,6 @@ impl CpuCollector {
         );
         
         Self {
-            config,
             name: "cpu".to_string(),
             load_thresholds,
             temperature_thresholds,
@@ -243,7 +241,4 @@ impl Collector for CpuCollector {
         Ok(metrics)
     }
 
-    fn get_performance_metrics(&self) -> Option<super::PerformanceMetrics> {
-        None // Performance tracking handled by cache system
-    }
 }

agent/src/collectors/disk.rs

@@ -9,7 +9,7 @@ use std::process::Command;
 use std::time::Instant;
 use tracing::debug;
 
-use super::{Collector, CollectorError, PerformanceMetrics};
+use super::{Collector, CollectorError};
 
 /// Information about a mounted disk
 #[derive(Debug, Clone)]
@@ -22,7 +22,6 @@ struct MountedDisk {
     used: String,            // e.g., "45G"
     available: String,       // e.g., "75G"
     usage_percent: f32,      // e.g., 38.5
-    config_name: Option<String>, // Name from config if UUID-based
 }
 
 /// Disk usage collector for monitoring filesystem sizes
@@ -117,7 +116,6 @@ impl DiskCollector {
                                 used,
                                 available,
                                 usage_percent: usage_percent as f32,
-                                config_name: Some(fs_config.name.clone()),
                             });
 
                             debug!(
@@ -611,7 +609,4 @@ impl Collector for DiskCollector {
         Ok(metrics)
     }
 
-    fn get_performance_metrics(&self) -> Option<PerformanceMetrics> {
-        None // Performance tracking handled by cache system
-    }
 }

agent/src/collectors/memory.rs

@@ -15,7 +15,6 @@ use crate::config::MemoryConfig;
 /// - No regex or complex parsing
 /// - <0.1ms collection time target
 pub struct MemoryCollector {
-    config: MemoryConfig,
     name: String,
     usage_thresholds: HysteresisThresholds,
 }
@@ -43,7 +42,6 @@ impl MemoryCollector {
         );
         
         Self {
-            config,
             name: "memory".to_string(),
             usage_thresholds,
         }
@@ -231,7 +229,4 @@ impl Collector for MemoryCollector {
         Ok(metrics)
     }
 
-    fn get_performance_metrics(&self) -> Option<super::PerformanceMetrics> {
-        None // Performance tracking handled by cache system
-    }
 }

agent/src/collectors/mod.rs

@@ -1,13 +1,6 @@
 use async_trait::async_trait;
 use cm_dashboard_shared::{Metric, StatusTracker};
-use std::time::Duration;
 
-/// Performance metrics for a collector
-#[derive(Debug, Clone)]
-pub struct PerformanceMetrics {
-    pub last_collection_time: Duration,
-    pub collection_efficiency_percent: f32,
-}
 
 pub mod backup;
 pub mod cpu;
@@ -28,10 +21,6 @@ pub trait Collector: Send + Sync {
     /// Collect all metrics this collector provides
     async fn collect(&self, status_tracker: &mut StatusTracker) -> Result<Vec<Metric>, CollectorError>;
 
-    /// Get performance metrics for monitoring collector efficiency
-    fn get_performance_metrics(&self) -> Option<PerformanceMetrics> {
-        None
-    }
 
 }
 

agent/src/collectors/systemd.rs

@@ -6,12 +6,10 @@ use std::sync::RwLock;
 use std::time::Instant;
 use tracing::debug;
 
-use super::{Collector, CollectorError, PerformanceMetrics};
+use super::{Collector, CollectorError};
 
 /// Systemd collector for monitoring systemd services
 pub struct SystemdCollector {
-    /// Performance tracking
-    last_collection_time: Option<std::time::Duration>,
     /// Cached state with thread-safe interior mutability
     state: RwLock<ServiceCacheState>,
 }
@@ -36,7 +34,6 @@ struct ServiceCacheState {
 impl SystemdCollector {
     pub fn new() -> Self {
         Self {
-            last_collection_time: None,
             state: RwLock::new(ServiceCacheState {
                 monitored_services: Vec::new(),
                 last_discovery_time: None,
@@ -481,9 +478,6 @@ impl Collector for SystemdCollector {
         Ok(metrics)
     }
 
-    fn get_performance_metrics(&self) -> Option<PerformanceMetrics> {
-        None // Performance tracking handled by cache system
-    }
 }
 
 impl SystemdCollector {
@@ -755,7 +749,6 @@ impl SystemdCollector {
     fn parse_server_block(&self, lines: &[&str], start_index: &mut usize) -> Option<String> {
         use tracing::debug;
         let mut server_names = Vec::new();
-        let mut proxy_pass_url = None;
         let mut has_redirect = false;
         let mut i = *start_index + 1;
         let mut brace_count = 1;
@@ -785,16 +778,6 @@ impl SystemdCollector {
                 }
             }
 
-            // Extract proxy_pass URL (backend IP:port)
-            if trimmed.starts_with("proxy_pass") {
-                if let Some(url_part) = trimmed.strip_prefix("proxy_pass") {
-                    let url_clean = url_part.trim().trim_end_matches(';');
-                    if !url_clean.is_empty() {
-                        proxy_pass_url = Some(url_clean.to_string());
-                        debug!("Found proxy_pass in block: {}", url_clean);
-                    }
-                }
-            }
 
             // Check for redirects (skip redirect-only servers)
             if trimmed.contains("return") && (trimmed.contains("301") || trimmed.contains("302")) {