sources: warn about sources exceeding maxdistance or maxjitter

Log a warning message if a source is rejected in the source selecting
due to exceeding the maxdistance or maxjitter limit to make it more
obvious when synchronization is failing for this reason. Delay the
message until the reachability register is full (8 updates), or a
replacement of the source is attempted.

Author: mlichvar

sources.c

@@ -768,6 +768,20 @@ mark_source(SRC_Instance inst, SRC_Status status)
 
   if (!inst->reported_status[status]) {
     switch (status) {
+      case SRC_BAD_DISTANCE:
+        if (inst->reachability_size < SOURCE_REACH_BITS && inst->bad < BAD_HANDLE_THRESHOLD)
+          break;
+        log_selection_source(LOGS_WARN, inst,
+                             "Root distance of ## exceeds maxdistance of %.3f seconds",
+                             max_distance);
+        break;
+      case SRC_JITTERY:
+        if (inst->reachability_size < SOURCE_REACH_BITS && inst->bad < BAD_HANDLE_THRESHOLD)
+          break;
+        log_selection_source(LOGS_WARN, inst,
+                             "Jitter of ## exceeds maxjitter of %.3f seconds",
+                             max_jitter);
+        break;
       case SRC_FALSETICKER:
         log_selection_source(LOGS_WARN, inst, "Detected falseticker ##");
         break;