huskies: merge 1156 story Periodic liveness tick so runtime freezes have a precise timestamp

server/src/config/mod.rs

@@ -167,6 +167,11 @@ pub struct WatcherConfig {
     /// state diverged. Default: 30 seconds.
     #[serde(default = "default_reconcile_interval_secs")]
     pub reconcile_interval_secs: u64,
+    /// How often (in seconds) the liveness tick task emits a heartbeat log line.
+    /// Reduce if 5-second granularity causes noise; increase to quiet the logs.
+    /// Default: 5 seconds.
+    #[serde(default = "default_liveness_tick_secs")]
+    pub liveness_tick_secs: u64,
 }
 
 impl Default for WatcherConfig {
@@ -175,6 +180,7 @@ impl Default for WatcherConfig {
             sweep_interval_secs: default_sweep_interval_secs(),
             done_retention_secs: default_done_retention_secs(),
             reconcile_interval_secs: default_reconcile_interval_secs(),
+            liveness_tick_secs: default_liveness_tick_secs(),
         }
     }
 }
@@ -191,6 +197,10 @@ fn default_reconcile_interval_secs() -> u64 {
     30
 }
 
+fn default_liveness_tick_secs() -> u64 {
+    5
+}
+
 fn default_qa() -> String {
     "server".to_string()
 }