Merge remote-tracking branch 'origin/topic/timw/pid-start-time-metric'

* origin/topic/timw/pid-start-time-metric:
  Add process_start_time_seconds and process_pid metrics

CHANGES

@@ -1,3 +1,7 @@
+8.0.0-dev.740 | 2025-07-24 10:39:42 -0700
+
+  * Add process_start_time_seconds and process_pid metrics (Tim Wojtulewicz, Corelight)
+
 8.0.0-dev.738 | 2025-07-24 08:00:57 -0700
 
   * CI: Only run weekly tasks as part of cron (Tim Wojtulewicz, Corelight)

VERSION

@@ -1 +1 @@
-8.0.0-dev.738
+8.0.0-dev.740

src/telemetry/Manager.cc

@@ -135,6 +135,10 @@ void Manager::InitPostScript() {
                               []() { return static_cast<double>(get_stats()->fds); });
 #endif
 
+    // These two metrics get set at startup and are never modified after.
+    process_start_time = GaugeInstance("process", "start_time", {}, "Process start time", "seconds");
+    process_start_time->Set(run_state::zeek_start_time);
+
     if ( ! iosource_mgr->RegisterFd(collector_flare.FD(), this) ) {
         reporter->FatalError("Failed to register telemetry collector descriptor");
     }

src/telemetry/Manager.h

@@ -282,6 +282,7 @@ private:
     CounterPtr cpu_user_counter;
     CounterPtr cpu_system_counter;
     GaugePtr fds_gauge;
+    GaugePtr process_start_time;
 
     std::shared_ptr<prometheus::Registry> prometheus_registry;
     std::unique_ptr<prometheus::Exposer> prometheus_exposer;

testing/btest/Baseline/scripts.base.frameworks.telemetry.process-collect/out

@@ -5,9 +5,11 @@ process_cpu_system_seconds_total, [], >0.0, good
 process_resident_memory_bytes, [], >0.0, good
 process_virtual_memory_bytes, [], >0.0, good
 process_open_fds, [], >0.0, good
+process_start_time_seconds, [], >0.0, good
 zeek_done
 process_cpu_user_seconds_total, [], >0.0, good
 process_cpu_system_seconds_total, [], >0.0, good
 process_resident_memory_bytes, [], >0.0, good
 process_virtual_memory_bytes, [], >0.0, good
 process_open_fds, [], >0.0, good
+process_start_time_seconds, [], >0.0, good