Update Prometheus metrics + Add Grafana sample (#339)

* Add time metrics

* Fix prometheus server parsing errors + fix cmd arg

* cmd arg here :)

* increase alarm interval

* fix naming

* add sample grafana dashboard

* add grafana info

* fix format issues

* add instance

README.md

@@ -41,6 +41,7 @@ Feel free to ask, use and report any bugs you encountered!
 - [Scripts](#scripts)
 - [Dependencies](#dependencies)
 - [Targets](#targets)
+- [Grafana](#grafana)
 
 ## CMake
 
@@ -92,3 +93,9 @@ Full dependency graph can be seen [here](doc/XXX-tree.svg)
  - dependency-graph : Prepares graphviz visualization of dependencies
  - package          : Prepares default packages which includes deb/rpm package and symbols with a systemd service. You should specify the desired package type with -DCPACK_GENERATOR="DEB" (or "RPM")
  - test             : Prepares gtest target
+
+## Grafana
+
+Since there is a Prometheus server integration, also there is a Grafana integration. You can find an example for dashboard [here](scripts/GrafanaDashboard-1730032129887.json). Also you can see screenshot of the dashboard below.
+
+<img src=doc/GrafanaDashboard.png>

include/metrics/ProcessMetrics.hpp

@@ -17,6 +17,8 @@ class ProcessMetrics {
 	std::unique_ptr<std::thread> _thread;		  ///< Thread handler
 	std::shared_ptr<std::atomic_flag> _checkFlag; ///< Runtime check flag
 
+	prometheus::Gauge *_pInitTime;			  ///< Pointer to initialization time gauge
+	prometheus::Gauge *_pCurrentTime;		  ///< Pointer to the current time gauge
 	prometheus::Gauge *_pMemory;			  ///< Pointer to the memory usage gauge
 	prometheus::Gauge *_pPageFaults;		  ///< Pointer to the page faults gauge
 	prometheus::Gauge *_pCpuUsage;			  ///< Pointer to the CPU usage gauge