diff --git a/src/telemetry/Manager.cc b/src/telemetry/Manager.cc
index fe0fb572d7..6c18cd038c 100644
--- a/src/telemetry/Manager.cc
+++ b/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");
     }
diff --git a/src/telemetry/Manager.h b/src/telemetry/Manager.h
index a25387a710..a237af3940 100644
--- a/src/telemetry/Manager.h
+++ b/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;
diff --git a/testing/btest/Baseline/scripts.base.frameworks.telemetry.process-collect/out b/testing/btest/Baseline/scripts.base.frameworks.telemetry.process-collect/out
index a080efc2a5..cb99fb2fc5 100644
--- a/testing/btest/Baseline/scripts.base.frameworks.telemetry.process-collect/out
+++ b/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