fix network metrics & grafana dashboard

number of top process consumer in config

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
+}