Add required metrics and datapoint attributes for Process tab in Host UI (#34)

* remove executable

* Add fields to start supporting Process tab

* update comment

* update comment

* Update name of the process state

Author: ishleenk17

remappers/hostmetrics/hostmetrics_test.go

@@ -42,6 +42,7 @@ var (
 	ProcPath         string = "/bin/run"
 	ProcName         string = "runner"
 	Cmdline          string = "./dist/otelcol-ishleen-custom --config collector.yml"
+	Processstate     string = "undefined"
 	Device           string = "en0"
 	Disk             string = "nvme0n1p128"
 	FilesystemDevice string = "dev/nvme0n1p1"
@@ -71,6 +72,7 @@ func doTestRemap(t *testing.T, id string, remapOpts ...Option) {
 			m["process.executable"] = ProcPath
 			m["process.name"] = ProcName
 			m["system.process.cmdline"] = Cmdline
+			m["system.process.state"] = Processstate
 		case "network":
 			m["system.network.name"] = Device
 		case "disk":
@@ -223,6 +225,7 @@ func doTestRemap(t *testing.T, id string, remapOpts ...Option) {
 			},
 			expected: []internal.TestMetric{
 				{Type: Sum, Name: "process.cpu.start_time", DP: internal.TestDP{Ts: now, Int: internal.Ptr(int64(0)), Attrs: outAttr("process")}},
+				{Type: Sum, Name: "system.process.cpu.start_time", DP: internal.TestDP{Ts: now, Int: internal.Ptr(int64(0)), Attrs: outAttr("process")}},
 				{Type: Sum, Name: "system.process.num_threads", DP: internal.TestDP{Ts: now, Int: internal.Ptr(int64(7)), Attrs: outAttr("process")}},
 				{Type: Gauge, Name: "system.process.memory.rss.pct", DP: internal.TestDP{Ts: now, Dbl: internal.Ptr(0.15), Attrs: outAttr("process")}},
 				{Type: Sum, Name: "system.process.memory.rss.bytes", DP: internal.TestDP{Ts: now, Int: internal.Ptr(int64(2048)), Attrs: outAttr("process")}},

remappers/hostmetrics/process.go

@@ -157,12 +157,20 @@ func remapProcessMetrics(
 	cpuPct = cpuTimeValue / float64(processRuntime)
 
 	remappers.AddMetrics(out, dataset, addProcessResources(resource),
+		// The timestamp metrics get converted from Int to Timestamp in Kibana
+		// since these are mapped to timestamp datatype
 		remappers.Metric{
 			DataType:  pmetric.MetricTypeSum,
 			Name:      "process.cpu.start_time",
 			Timestamp: timestamp,
 			IntValue:  &startTime,
 		},
+		remappers.Metric{
+			DataType:  pmetric.MetricTypeSum,
+			Name:      "system.process.cpu.start_time",
+			Timestamp: timestamp,
+			IntValue:  &startTime,
+		},
 		remappers.Metric{
 			DataType:  pmetric.MetricTypeSum,
 			Name:      "system.process.num_threads",
@@ -281,5 +289,8 @@ func addProcessResources(resource pcommon.Resource) func(pmetric.NumberDataPoint
 		if cmdline.Str() != "" {
 			dp.Attributes().PutStr("system.process.cmdline", cmdline.Str())
 		}
+		//Adding dummy value to process.state as "undefined", since this field is not
+		//available through Hostmetrics receiver currently and Process tab in Curated UI's need this field as a prerequisite.
+		dp.Attributes().PutStr("system.process.state", "undefined")
 	}
 }