fix network metrics & grafana dashboard

number of top process consumer in config

docker-compose/grafana/provisioning/dashboards/bottom-overview.json

@@ -66,12 +66,12 @@
         "gridPos": {"h": 8, "w": 12, "x": 0, "y": 8},
         "targets": [
           {
-            "expr": "system_network_rx_bytes_rate",
+            "expr": "system_network_rx_bytes_per_sec",
             "legendFormat": "RX - {{interface}}",
             "refId": "RX"
           },
           {
-            "expr": "system_network_tx_bytes_rate",
+            "expr": "system_network_tx_bytes_per_sec",
             "legendFormat": "TX - {{interface}}",
             "refId": "TX"
           }

docker-compose/processes-example.toml

@@ -9,7 +9,7 @@
 # Filter mode: "whitelist" or "blacklist"
 # - whitelist: Only export metrics for processes in the lists below
 # - blacklist: Export metrics for all processes EXCEPT those in the lists
-filter_mode = "whitelist"
+filter_mode = "blacklist"
 
 # Process names to monitor (case-insensitive substring match)
 # Examples for common server processes:

src/collector.rs

@@ -1,5 +1,7 @@
 use crate::config::MetricsConfig;
 use anyhow::Result;
+use std::collections::HashMap;
+use std::time::Instant;
 use sysinfo::{CpuRefreshKind, Disks, Networks, RefreshKind, System};
 
 /// System metrics collected at a point in time
@@ -30,8 +32,8 @@ pub struct MemoryMetric {
 #[derive(Debug, Clone)]
 pub struct NetworkMetric {
     pub interface_name: String,
-    pub rx_bytes_total: u64,
+    pub rx_bytes_per_sec: u64,
-    pub tx_bytes_total: u64,
+    pub tx_bytes_per_sec: u64,
 }
 
 #[derive(Debug, Clone)]
@@ -62,6 +64,9 @@ pub struct MetricsCollector {
     networks: Networks,
     disks: Disks,
     config: MetricsConfig,
+    // Network rate calculation state
+    last_network_stats: HashMap<String, (u64, u64)>, // interface -> (rx_bytes, tx_bytes)
+    last_network_time: Option<Instant>,
 }
 
 impl MetricsCollector {
@@ -76,6 +81,8 @@ impl MetricsCollector {
             networks: Networks::new_with_refreshed_list(),
             disks: Disks::new_with_refreshed_list(),
             config,
+            last_network_stats: HashMap::new(),
+            last_network_time: None,
         }
     }
 
@@ -140,15 +147,62 @@ impl MetricsCollector {
         }
     }
 
-    fn collect_network(&self) -> Vec<NetworkMetric> {
+    fn collect_network(&mut self) -> Vec<NetworkMetric> {
-        self.networks
+        let now = Instant::now();
-            .iter()
+        let mut metrics = Vec::new();
-            .map(|(interface_name, data)| NetworkMetric {
+
+        // Calculate time delta
+        let time_delta_secs = if let Some(last_time) = self.last_network_time {
+            now.duration_since(last_time).as_secs_f64()
+        } else {
+            // First collection, no rate to calculate
+            self.last_network_time = Some(now);
+            for (interface_name, data) in self.networks.iter() {
+                self.last_network_stats.insert(
+                    interface_name.to_string(),
+                    (data.total_received(), data.total_transmitted()),
+                );
+            }
+            return metrics; // Return empty on first run
+        };
+
+        // Update timestamp
+        self.last_network_time = Some(now);
+
+        // Calculate rates for each interface
+        for (interface_name, data) in self.networks.iter() {
+            let rx_total = data.total_received();
+            let tx_total = data.total_transmitted();
+
+            if let Some(&(last_rx, last_tx)) = self.last_network_stats.get(interface_name.as_str()) {
+                // Calculate bytes per second
+                let rx_bytes_per_sec = if rx_total >= last_rx {
+                    ((rx_total - last_rx) as f64 / time_delta_secs) as u64
+                } else {
+                    0 // Counter wrapped or interface reset
+                };
+
+                let tx_bytes_per_sec = if tx_total >= last_tx {
+                    ((tx_total - last_tx) as f64 / time_delta_secs) as u64
+                } else {
+                    0 // Counter wrapped or interface reset
+                };
+
+                metrics.push(NetworkMetric {
                     interface_name: interface_name.to_string(),
-                rx_bytes_total: data.total_received(),
+                    rx_bytes_per_sec,
-                tx_bytes_total: data.total_transmitted(),
+                    tx_bytes_per_sec,
-            })
+                });
-            .collect()
+            }
+
+            // Update last stats
+            self.last_network_stats.insert(
+                interface_name.to_string(),
+                (rx_total, tx_total),
+            );
+        }
+
+        metrics
     }
 
     fn collect_disk(&self) -> Vec<DiskMetric> {
@@ -194,13 +248,17 @@ impl MetricsCollector {
             })
             .collect();
 
-        // Sort by CPU usage and limit to top 10
+        // Sort by CPU usage and limit to top N (configurable)
         processes.sort_by(|a, b| {
             b.cpu_usage_percent
                 .partial_cmp(&a.cpu_usage_percent)
                 .unwrap_or(std::cmp::Ordering::Equal)
         });
-        processes.truncate(10);
+
+        let max_processes = filter
+            .map(|f| f.max_processes)
+            .unwrap_or(10);
+        processes.truncate(max_processes);
 
         processes
     }

src/config.rs

@@ -195,6 +195,10 @@ pub struct ProcessFilterConfig {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub filter_mode: Option<ProcessFilterMode>,
 
+    /// Maximum number of processes to report (top N by CPU usage)
+    #[serde(default = "default_max_processes")]
+    pub max_processes: usize,
+
     /// List of process names to filter (case-insensitive substring match)
     #[serde(default)]
     pub names: Vec<String>,
@@ -236,6 +240,7 @@ impl ProcessFilterConfig {
             let mut merged = Self {
                 include: None,
                 filter_mode: included.filter_mode.or(self.filter_mode),
+                max_processes: included.max_processes,
                 names: if included.names.is_empty() {
                     self.names.clone()
                 } else {
@@ -345,3 +350,7 @@ fn default_timeout() -> u64 {
 fn default_true() -> bool {
     true
 }
+
+fn default_max_processes() -> usize {
+    10
+}

src/exporter.rs

@@ -18,8 +18,8 @@ struct MetricInstruments {
     memory_total: opentelemetry::metrics::Gauge<u64>,
     swap_usage: opentelemetry::metrics::Gauge<u64>,
     swap_total: opentelemetry::metrics::Gauge<u64>,
-    network_rx: opentelemetry::metrics::Counter<u64>,
+    network_rx: opentelemetry::metrics::Gauge<u64>,
-    network_tx: opentelemetry::metrics::Counter<u64>,
+    network_tx: opentelemetry::metrics::Gauge<u64>,
     disk_usage: opentelemetry::metrics::Gauge<u64>,
     disk_total: opentelemetry::metrics::Gauge<u64>,
     process_cpu: opentelemetry::metrics::Gauge<f64>,
@@ -87,12 +87,12 @@ impl MetricsExporter {
                 .with_description("Total swap in bytes")
                 .init(),
             network_rx: meter
-                .u64_counter("system_network_rx_bytes_total")
+                .u64_gauge("system_network_rx_bytes_per_sec")
-                .with_description("Total bytes received")
+                .with_description("Bytes received per second")
                 .init(),
             network_tx: meter
-                .u64_counter("system_network_tx_bytes_total")
+                .u64_gauge("system_network_tx_bytes_per_sec")
-                .with_description("Total bytes transmitted")
+                .with_description("Bytes transmitted per second")
                 .init(),
             disk_usage: meter
                 .u64_gauge("system_disk_usage_bytes")
@@ -145,8 +145,8 @@ impl MetricsExporter {
         if let Some(network_metrics) = &metrics.network {
             for net in network_metrics {
                 let attrs = &[KeyValue::new("interface", net.interface_name.clone())];
-                self.gauges.network_rx.add(net.rx_bytes_total, attrs);
+                self.gauges.network_rx.record(net.rx_bytes_per_sec, attrs);
-                self.gauges.network_tx.add(net.tx_bytes_total, attrs);
+                self.gauges.network_tx.record(net.tx_bytes_per_sec, attrs);
             }
         }
 

symon.toml

@@ -35,7 +35,7 @@ cpu = true           # CPU usage per core
 memory = true        # RAM and swap usage
 network = true       # Network RX/TX
 disk = true          # Disk usage
-processes = false    # Top 10 processes (disabled by default - can generate high cardinality)
+processes = true     # Top 10 processes (disabled by default - can generate high cardinality)
 temperature = true   # System temperatures (if available)
 
 # Process filtering configuration
@@ -46,23 +46,16 @@ temperature = true   # System temperatures (if available)
 
 # Option 2: Configure inline
 # Filter mode: "whitelist" (only listed processes) or "blacklist" (exclude listed)
-filter_mode = "whitelist"
+filter_mode = "blacklist"
+
+# Maximum number of processes to report (sorted by CPU usage, default: 10)
+max_processes = 10
 
 # List of process names to filter (case-insensitive substring match)
 names = [
-    # Web servers
+    # Exclude system processes that generate too much noise
-    "nginx",
+    # "kworker",
-    "apache",
+    # "systemd",
-
-    # Databases
-    "postgres",
-    "mysql",
-    "redis",
-
-    # Application servers
-    # "java",
-    # "node",
-    # "python",
 ]
 
 # List of regex patterns to match process names (case-sensitive)