fix chrony refids

src/sources/chrony.rs

@@ -2,6 +2,7 @@ use std::net::{SocketAddr, ToSocketAddrs};
 use std::sync::Arc;
 
 use async_trait::async_trait;
+use chrony_candm::common::ChronyAddr;
 use chrony_candm::reply::{self, ReplyBody, SourceMode};
 use chrony_candm::request::{self, RequestBody};
 use chrony_candm::{ClientOptions, blocking_query};
@@ -40,6 +41,23 @@ pub struct ChronyTrackingReport {
     pub last_update_interval: f64,
 }
 
+pub fn addr_to_string(addr: &ChronyAddr) -> String {
+    match addr {
+        ChronyAddr::V4(a) => a
+            .octets()
+            .iter()
+            .map_while(|c| {
+                if *c == 0 {
+                    None
+                } else {
+                    Some(char::from_u32(*c as u32).unwrap())
+                }
+            })
+            .collect(),
+        _ => addr.to_string(),
+    }
+}
+
 impl SourceReportDetails for ChronyTrackingReport {
     fn is_healthy(&self) -> bool {
         true
@@ -79,8 +97,12 @@ impl SourceReportDetails for ChronySourcesReport {
         let mut metrics = Vec::with_capacity(self.sources.len());
 
         for source in &self.sources {
+            let ref_id = match source.stratum {
+                0 => addr_to_string(&source.ip_addr),
+                _ => source.ip_addr.to_string(),
+            };
             let tags = Arc::new(vec![
-                ("ref_id", source.ip_addr.to_string()),
+                ("ref_id", ref_id),
                 (
                     "mode",
                     match source.mode {