prometheus: replace string literals with constants

agents/prometheus.go

@@ -32,6 +32,51 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
+// Prometheus metric names
+const (
+	// Gauge metrics
+	promGoGoroutines                 = "go_goroutines"
+	promGoThreads                    = "go_threads"
+	promProcessOpenFds               = "process_open_fds"
+	promProcessMaxFds                = "process_max_fds"
+	promProcessResidentMemoryBytes   = "process_resident_memory_bytes"
+	promProcessVirtualMemoryBytes    = "process_virtual_memory_bytes"
+	promProcessVirtualMemoryMaxBytes = "process_virtual_memory_max_bytes"
+	promProcessStartTimeSeconds      = "process_start_time_seconds"
+	promGoMemstatsAllocBytes         = "go_memstats_alloc_bytes"
+	promGoMemstatsHeapAllocBytes     = "go_memstats_heap_alloc_bytes"
+	promGoMemstatsHeapIdleBytes      = "go_memstats_heap_idle_bytes"
+	promGoMemstatsHeapInuseBytes     = "go_memstats_heap_inuse_bytes"
+	promGoMemstatsHeapObjects        = "go_memstats_heap_objects"
+	promGoMemstatsHeapReleasedBytes  = "go_memstats_heap_released_bytes"
+	promGoMemstatsHeapSysBytes       = "go_memstats_heap_sys_bytes"
+	promGoMemstatsBuckHashSysBytes   = "go_memstats_buck_hash_sys_bytes"
+	promGoMemstatsGCSysBytes         = "go_memstats_gc_sys_bytes"
+	promGoMemstatsMCacheInuseBytes   = "go_memstats_mcache_inuse_bytes"
+	promGoMemstatsMCacheSysBytes     = "go_memstats_mcache_sys_bytes"
+	promGoMemstatsMSpanInuseBytes    = "go_memstats_mspan_inuse_bytes"
+	promGoMemstatsMSpanSysBytes      = "go_memstats_mspan_sys_bytes"
+	promGoMemstatsNextGCBytes        = "go_memstats_next_gc_bytes"
+	promGoMemstatsOtherSysBytes      = "go_memstats_other_sys_bytes"
+	promGoMemstatsStackInuseBytes    = "go_memstats_stack_inuse_bytes"
+	promGoMemstatsStackSysBytes      = "go_memstats_stack_sys_bytes"
+	promGoMemstatsSysBytes           = "go_memstats_sys_bytes"
+	promGoMemstatsLastGCTimeSeconds  = "go_memstats_last_gc_time_seconds"
+	promGoGCGogcPercent              = "go_gc_gogc_percent"
+	promGoGCGomemlimitBytes          = "go_gc_gomemlimit_bytes"
+	promGoSchedGomaxprocsThreads     = "go_sched_gomaxprocs_threads"
+	promGoInfo                       = "go_info"
+	promGoGCDurationSeconds          = "go_gc_duration_seconds"
+
+	// Counter metrics
+	promProcessCPUSecondsTotal          = "process_cpu_seconds_total"
+	promProcessNetworkReceiveByteTotal  = "process_network_receive_bytes_total"
+	promProcessNetworkTransmitByteTotal = "process_network_transmit_bytes_total"
+	promGoMemstatsAllocBytesTotal       = "go_memstats_alloc_bytes_total"
+	promGoMemstatsMallocsTotal          = "go_memstats_mallocs_total"
+	promGoMemstatsFreesTotal            = "go_memstats_frees_total"
+)
+
 // PrometheusAgent handles metrics collection for Prometheus.
 // It collects stats from StatQueues and exposes them alongside
 // optional Go runtime and process metrics.
@@ -140,61 +185,61 @@ func newCoreMetricsCollector(cfg *config.CGRConfig, cm *engine.ConnManager) *cor
 	}
 
 	gaugeMetrics := map[string]string{
-		"go_goroutines":                    "Number of goroutines that currently exist.",
-		"go_threads":                       "Number of OS threads created.",
-		"process_open_fds":                 "Number of open file descriptors.",
-		"process_max_fds":                  "Maximum number of open file descriptors.",
-		"process_resident_memory_bytes":    "Resident memory size in bytes.",
-		"process_virtual_memory_bytes":     "Virtual memory size in bytes.",
-		"process_virtual_memory_max_bytes": "Maximum amount of virtual memory available in bytes.",
-		"process_start_time_seconds":       "Start time of the process since unix epoch in seconds.",
-		"go_memstats_alloc_bytes":          "Number of bytes allocated in heap and currently in use. Equals to /memory/classes/heap/objects:bytes.",
-		"go_memstats_heap_alloc_bytes":     "Number of heap bytes allocated and currently in use, same as go_memstats_alloc_bytes. Equals to /memory/classes/heap/objects:bytes.",
-		"go_memstats_heap_idle_bytes":      "Number of heap bytes waiting to be used. Equals to /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.",
-		"go_memstats_heap_inuse_bytes":     "Number of heap bytes that are in use. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes",
-		"go_memstats_heap_objects":         "Number of currently allocated objects. Equals to /gc/heap/objects:objects.",
-		"go_memstats_heap_released_bytes":  "Number of heap bytes released to OS. Equals to /memory/classes/heap/released:bytes.",
-		"go_memstats_heap_sys_bytes":       "Number of heap bytes obtained from system. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes + /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.",
-		"go_memstats_buck_hash_sys_bytes":  "Number of bytes used by the profiling bucket hash table. Equals to /memory/classes/profiling/buckets:bytes.",
-		"go_memstats_gc_sys_bytes":         "Number of bytes used for garbage collection system metadata. Equals to /memory/classes/metadata/other:bytes.",
-		"go_memstats_mcache_inuse_bytes":   "Number of bytes in use by mcache structures. Equals to /memory/classes/metadata/mcache/inuse:bytes.",
-		"go_memstats_mcache_sys_bytes":     "Number of bytes used for mcache structures obtained from system. Equals to /memory/classes/metadata/mcache/inuse:bytes + /memory/classes/metadata/mcache/free:bytes.",
-		"go_memstats_mspan_inuse_bytes":    "Number of bytes in use by mspan structures. Equals to /memory/classes/metadata/mspan/inuse:bytes.",
-		"go_memstats_mspan_sys_bytes":      "Number of bytes used for mspan structures obtained from system. Equals to /memory/classes/metadata/mspan/inuse:bytes + /memory/classes/metadata/mspan/free:bytes.",
-		"go_memstats_next_gc_bytes":        "Number of heap bytes when next garbage collection will take place. Equals to /gc/heap/goal:bytes.",
-		"go_memstats_other_sys_bytes":      "Number of bytes used for other system allocations. Equals to /memory/classes/other:bytes.",
-		"go_memstats_stack_inuse_bytes":    "Number of bytes obtained from system for stack allocator in non-CGO environments. Equals to /memory/classes/heap/stacks:bytes.",
-		"go_memstats_stack_sys_bytes":      "Number of bytes obtained from system for stack allocator. Equals to /memory/classes/heap/stacks:bytes + /memory/classes/os-stacks:bytes.",
-		"go_memstats_sys_bytes":            "Number of bytes obtained from system. Equals to /memory/classes/total:byte.",
-		"go_memstats_last_gc_time_seconds": "Number of seconds since 1970 of last garbage collection.",
-		"go_gc_gogc_percent":               "Heap size target percentage configured by the user, otherwise 100. This value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent function. Sourced from /gc/gogc:percent.",
-		"go_gc_gomemlimit_bytes":           "Go runtime memory limit configured by the user, otherwise math.MaxInt64. This value is set by the GOMEMLIMIT environment variable, and the runtime/debug.SetMemoryLimit function. Sourced from /gc/gomemlimit:bytes.",
-		"go_sched_gomaxprocs_threads":      "The current runtime.GOMAXPROCS setting, or the number of operating system threads that can execute user-level Go code simultaneously. Sourced from /sched/gomaxprocs:threads.",
+		promGoGoroutines:                 "Number of goroutines that currently exist.",
+		promGoThreads:                    "Number of OS threads created.",
+		promProcessOpenFds:               "Number of open file descriptors.",
+		promProcessMaxFds:                "Maximum number of open file descriptors.",
+		promProcessResidentMemoryBytes:   "Resident memory size in bytes.",
+		promProcessVirtualMemoryBytes:    "Virtual memory size in bytes.",
+		promProcessVirtualMemoryMaxBytes: "Maximum amount of virtual memory available in bytes.",
+		promProcessStartTimeSeconds:      "Start time of the process since unix epoch in seconds.",
+		promGoMemstatsAllocBytes:         "Number of bytes allocated in heap and currently in use. Equals to /memory/classes/heap/objects:bytes.",
+		promGoMemstatsHeapAllocBytes:     "Number of heap bytes allocated and currently in use, same as go_memstats_alloc_bytes. Equals to /memory/classes/heap/objects:bytes.",
+		promGoMemstatsHeapIdleBytes:      "Number of heap bytes waiting to be used. Equals to /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.",
+		promGoMemstatsHeapInuseBytes:     "Number of heap bytes that are in use. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes",
+		promGoMemstatsHeapObjects:        "Number of currently allocated objects. Equals to /gc/heap/objects:objects.",
+		promGoMemstatsHeapReleasedBytes:  "Number of heap bytes released to OS. Equals to /memory/classes/heap/released:bytes.",
+		promGoMemstatsHeapSysBytes:       "Number of heap bytes obtained from system. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes + /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.",
+		promGoMemstatsBuckHashSysBytes:   "Number of bytes used by the profiling bucket hash table. Equals to /memory/classes/profiling/buckets:bytes.",
+		promGoMemstatsGCSysBytes:         "Number of bytes used for garbage collection system metadata. Equals to /memory/classes/metadata/other:bytes.",
+		promGoMemstatsMCacheInuseBytes:   "Number of bytes in use by mcache structures. Equals to /memory/classes/metadata/mcache/inuse:bytes.",
+		promGoMemstatsMCacheSysBytes:     "Number of bytes used for mcache structures obtained from system. Equals to /memory/classes/metadata/mcache/inuse:bytes + /memory/classes/metadata/mcache/free:bytes.",
+		promGoMemstatsMSpanInuseBytes:    "Number of bytes in use by mspan structures. Equals to /memory/classes/metadata/mspan/inuse:bytes.",
+		promGoMemstatsMSpanSysBytes:      "Number of bytes used for mspan structures obtained from system. Equals to /memory/classes/metadata/mspan/inuse:bytes + /memory/classes/metadata/mspan/free:bytes.",
+		promGoMemstatsNextGCBytes:        "Number of heap bytes when next garbage collection will take place. Equals to /gc/heap/goal:bytes.",
+		promGoMemstatsOtherSysBytes:      "Number of bytes used for other system allocations. Equals to /memory/classes/other:bytes.",
+		promGoMemstatsStackInuseBytes:    "Number of bytes obtained from system for stack allocator in non-CGO environments. Equals to /memory/classes/heap/stacks:bytes.",
+		promGoMemstatsStackSysBytes:      "Number of bytes obtained from system for stack allocator. Equals to /memory/classes/heap/stacks:bytes + /memory/classes/os-stacks:bytes.",
+		promGoMemstatsSysBytes:           "Number of bytes obtained from system. Equals to /memory/classes/total:byte.",
+		promGoMemstatsLastGCTimeSeconds:  "Number of seconds since 1970 of last garbage collection.",
+		promGoGCGogcPercent:              "Heap size target percentage configured by the user, otherwise 100. This value is set by the GOGC environment variable, and the runtime/debug.SetGCPercent function. Sourced from /gc/gogc:percent.",
+		promGoGCGomemlimitBytes:          "Go runtime memory limit configured by the user, otherwise math.MaxInt64. This value is set by the GOMEMLIMIT environment variable, and the runtime/debug.SetMemoryLimit function. Sourced from /gc/gomemlimit:bytes.",
+		promGoSchedGomaxprocsThreads:     "The current runtime.GOMAXPROCS setting, or the number of operating system threads that can execute user-level Go code simultaneously. Sourced from /sched/gomaxprocs:threads.",
 	}
 	for name, help := range gaugeMetrics {
 		c.descs[name] = prometheus.NewDesc(name, help, []string{"node_id"}, nil)
 	}
 
 	counterMetrics := map[string]string{
-		"process_cpu_seconds_total":            "Total user and system CPU time spent in seconds.",
-		"process_network_receive_bytes_total":  "Number of bytes received by the process over the network.",
-		"process_network_transmit_bytes_total": "Number of bytes sent by the process over the network.",
-		"go_memstats_alloc_bytes_total":        "Total number of bytes allocated in heap until now, even if released already. Equals to /gc/heap/allocs:bytes.",
-		"go_memstats_mallocs_total":            "Total number of heap objects allocated, both live and gc-ed. Semantically a counter version for go_memstats_heap_objects gauge. Equals to /gc/heap/allocs:objects + /gc/heap/tiny/allocs:objects.",
-		"go_memstats_frees_total":              "Total number of heap objects frees. Equals to /gc/heap/frees:objects + /gc/heap/tiny/allocs:objects.",
+		promProcessCPUSecondsTotal:          "Total user and system CPU time spent in seconds.",
+		promProcessNetworkReceiveByteTotal:  "Number of bytes received by the process over the network.",
+		promProcessNetworkTransmitByteTotal: "Number of bytes sent by the process over the network.",
+		promGoMemstatsAllocBytesTotal:       "Total number of bytes allocated in heap until now, even if released already. Equals to /gc/heap/allocs:bytes.",
+		promGoMemstatsMallocsTotal:          "Total number of heap objects allocated, both live and gc-ed. Semantically a counter version for go_memstats_heap_objects gauge. Equals to /gc/heap/allocs:objects + /gc/heap/tiny/allocs:objects.",
+		promGoMemstatsFreesTotal:            "Total number of heap objects frees. Equals to /gc/heap/frees:objects + /gc/heap/tiny/allocs:objects.",
 	}
 	for name, help := range counterMetrics {
 		c.descs[name] = prometheus.NewDesc(name, help, []string{"node_id"}, nil)
 	}
 
-	c.descs["go_info"] = prometheus.NewDesc(
-		"go_info",
+	c.descs[promGoInfo] = prometheus.NewDesc(
+		promGoInfo,
 		"Information about the Go environment.",
 		[]string{"node_id", "version"},
 		nil)
 
-	c.descs["go_gc_duration_seconds"] = prometheus.NewDesc(
-		"go_gc_duration_seconds",
+	c.descs[promGoGCDurationSeconds] = prometheus.NewDesc(
+		promGoGCDurationSeconds,
 		"A summary of the wall-time pause (stop-the-world) duration in garbage collection cycles.",
 		[]string{"node_id"},
 		nil,
@@ -224,112 +269,112 @@ func (c *coreMetricsCollector) Collect(ch chan<- prometheus.Metric) {
 				utils.PrometheusAgent, connID, err))
 			continue
 		}
-		nodeID, ok := reply["node_id"].(string)
+		nodeID, ok := reply[utils.NodeID].(string)
 		if !ok {
 			panic("missing node_id in CoreSv1.Status reply")
 		}
 
-		if val, ok := reply["goroutines"].(float64); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_goroutines"], prometheus.GaugeValue, val, nodeID)
+		if val, ok := reply[utils.MetricRuntimeGoroutines].(float64); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoGoroutines], prometheus.GaugeValue, val, nodeID)
 		}
-		if val, ok := reply["threads"].(float64); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_threads"], prometheus.GaugeValue, val, nodeID)
+		if val, ok := reply[utils.MetricRuntimeThreads].(float64); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoThreads], prometheus.GaugeValue, val, nodeID)
 		}
-		if version, ok := reply["go_version"].(string); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_info"], prometheus.GaugeValue, 1, nodeID, version)
+		if version, ok := reply[utils.GoVersion].(string); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoInfo], prometheus.GaugeValue, 1, nodeID, version)
 		}
 
-		if procStats, ok := reply["proc_stats"].(map[string]any); ok {
-			if val, ok := procStats["cpu_time"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_cpu_seconds_total"], prometheus.CounterValue, val, nodeID)
+		if procStats, ok := reply[utils.FieldProcStats].(map[string]any); ok {
+			if val, ok := procStats[utils.MetricProcCPUTime].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessCPUSecondsTotal], prometheus.CounterValue, val, nodeID)
 			}
-			if val, ok := procStats["open_fds"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_open_fds"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcOpenFDs].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessOpenFds], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["max_fds"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_max_fds"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcMaxFDs].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessMaxFds], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["resident_memory"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_resident_memory_bytes"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcResidentMemory].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessResidentMemoryBytes], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["virtual_memory"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_virtual_memory_bytes"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcVirtualMemory].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessVirtualMemoryBytes], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["max_virtual_memory"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_virtual_memory_max_bytes"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcMaxVirtualMemory].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessVirtualMemoryMaxBytes], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["start_time"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_start_time_seconds"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcStartTime].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessStartTimeSeconds], prometheus.GaugeValue, val, nodeID)
 			}
-			if val, ok := procStats["network_receive_total"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_network_receive_bytes_total"], prometheus.CounterValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcNetworkReceiveTotal].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessNetworkReceiveByteTotal], prometheus.CounterValue, val, nodeID)
 			}
-			if val, ok := procStats["network_transmit_total"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["process_network_transmit_bytes_total"], prometheus.CounterValue, val, nodeID)
+			if val, ok := procStats[utils.MetricProcNetworkTransmitTotal].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promProcessNetworkTransmitByteTotal], prometheus.CounterValue, val, nodeID)
 			}
 		}
 
-		if memStats, ok := reply["mem_stats"].(map[string]any); ok {
-			memGaugeMap := map[string]string{
-				"go_memstats_alloc_bytes":         "alloc",
-				"go_memstats_heap_alloc_bytes":    "heap_alloc",
-				"go_memstats_heap_idle_bytes":     "heap_idle",
-				"go_memstats_heap_inuse_bytes":    "heap_inuse",
-				"go_memstats_heap_objects":        "heap_objects",
-				"go_memstats_heap_released_bytes": "heap_released",
-				"go_memstats_heap_sys_bytes":      "heap_sys",
-				"go_memstats_buck_hash_sys_bytes": "buckhash_sys",
-				"go_memstats_gc_sys_bytes":        "gc_sys",
-				"go_memstats_mcache_inuse_bytes":  "mcache_inuse",
-				"go_memstats_mcache_sys_bytes":    "mcache_sys",
-				"go_memstats_mspan_inuse_bytes":   "mspan_inuse",
-				"go_memstats_mspan_sys_bytes":     "mspan_sys",
-				"go_memstats_next_gc_bytes":       "next_gc",
-				"go_memstats_other_sys_bytes":     "other_sys",
-				"go_memstats_stack_inuse_bytes":   "stack_inuse",
-				"go_memstats_stack_sys_bytes":     "stack_sys",
-				"go_memstats_sys_bytes":           "sys",
+		if memStats, ok := reply[utils.FieldMemStats].(map[string]any); ok {
+			var memGaugeMap = map[string]string{
+				promGoMemstatsAllocBytes:        utils.MetricMemAlloc,
+				promGoMemstatsHeapAllocBytes:    utils.MetricMemHeapAlloc,
+				promGoMemstatsHeapIdleBytes:     utils.MetricMemHeapIdle,
+				promGoMemstatsHeapInuseBytes:    utils.MetricMemHeapInuse,
+				promGoMemstatsHeapObjects:       utils.MetricMemHeapObjects,
+				promGoMemstatsHeapReleasedBytes: utils.MetricMemHeapReleased,
+				promGoMemstatsHeapSysBytes:      utils.MetricMemHeapSys,
+				promGoMemstatsBuckHashSysBytes:  utils.MetricMemBuckHashSys,
+				promGoMemstatsGCSysBytes:        utils.MetricMemGCSys,
+				promGoMemstatsMCacheInuseBytes:  utils.MetricMemMCacheInuse,
+				promGoMemstatsMCacheSysBytes:    utils.MetricMemMCacheSys,
+				promGoMemstatsMSpanInuseBytes:   utils.MetricMemMSpanInuse,
+				promGoMemstatsMSpanSysBytes:     utils.MetricMemMSpanSys,
+				promGoMemstatsNextGCBytes:       utils.MetricMemNextGC,
+				promGoMemstatsOtherSysBytes:     utils.MetricMemOtherSys,
+				promGoMemstatsStackInuseBytes:   utils.MetricMemStackInuse,
+				promGoMemstatsStackSysBytes:     utils.MetricMemStackSys,
+				promGoMemstatsSysBytes:          utils.MetricMemSys,
 			}
 			for metricName, key := range memGaugeMap {
 				if val, ok := memStats[key].(float64); ok {
 					ch <- prometheus.MustNewConstMetric(c.descs[metricName], prometheus.GaugeValue, val, nodeID)
 				}
 			}
-			memCounterMap := map[string]string{
-				"go_memstats_alloc_bytes_total": "total_alloc",
-				"go_memstats_mallocs_total":     "mallocs",
-				"go_memstats_frees_total":       "frees",
+			var memCounterMap = map[string]string{
+				promGoMemstatsAllocBytesTotal: utils.MetricMemTotalAlloc,
+				promGoMemstatsMallocsTotal:    utils.MetricMemMallocs,
+				promGoMemstatsFreesTotal:      utils.MetricMemFrees,
 			}
 			for metricName, key := range memCounterMap {
 				if val, ok := memStats[key].(float64); ok {
 					ch <- prometheus.MustNewConstMetric(c.descs[metricName], prometheus.CounterValue, val, nodeID)
 				}
 			}
-			if val, ok := memStats["last_gc"].(float64); ok {
-				ch <- prometheus.MustNewConstMetric(c.descs["go_memstats_last_gc_time_seconds"], prometheus.GaugeValue, val, nodeID)
+			if val, ok := memStats[utils.MetricMemLastGC].(float64); ok {
+				ch <- prometheus.MustNewConstMetric(c.descs[promGoMemstatsLastGCTimeSeconds], prometheus.GaugeValue, val, nodeID)
 			}
 		}
 
-		if gcStats, ok := reply["gc_duration_stats"].(map[string]any); ok {
+		if gcStats, ok := reply[utils.FieldGCDurationStats].(map[string]any); ok {
 			var count uint64
 			var sum float64
 			quantileValues := make(map[float64]float64)
-			if c, ok := gcStats["count"].(float64); ok {
+			if c, ok := gcStats[utils.MetricGCCount].(float64); ok {
 				count = uint64(c)
 			}
-			if s, ok := gcStats["sum"].(float64); ok {
+			if s, ok := gcStats[utils.MetricGCSum].(float64); ok {
 				sum = s
 			}
 
 			// Handle different types that may be returned based on connection type:
 			// - []any: from serialized RPC connections where type information is lost
 			// - []cores.Quantile: from direct (*internal) calls where type is preserved
-			switch quantiles := gcStats["quantiles"].(type) {
+			switch quantiles := gcStats[utils.MetricGCQuantiles].(type) {
 			case []any:
 				for _, q := range quantiles {
 					if qMap, ok := q.(map[string]any); ok {
-						if quantile, ok := qMap["quantile"].(float64); ok {
-							if val, ok := qMap["value"].(float64); ok {
+						if quantile, ok := qMap[utils.MetricGCQuantile].(float64); ok {
+							if val, ok := qMap[utils.MetricGCValue].(float64); ok {
 								quantileValues[quantile] = val
 							}
 						}
@@ -342,7 +387,7 @@ func (c *coreMetricsCollector) Collect(ch chan<- prometheus.Metric) {
 			}
 
 			ch <- prometheus.MustNewConstSummary(
-				c.descs["go_gc_duration_seconds"],
+				c.descs[promGoGCDurationSeconds],
 				count,
 				sum,
 				quantileValues,
@@ -350,14 +395,14 @@ func (c *coreMetricsCollector) Collect(ch chan<- prometheus.Metric) {
 			)
 		}
 
-		if val, ok := reply["go_maxprocs"].(float64); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_sched_gomaxprocs_threads"], prometheus.GaugeValue, val, nodeID)
+		if val, ok := reply[utils.MetricRuntimeMaxProcs].(float64); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoSchedGomaxprocsThreads], prometheus.GaugeValue, val, nodeID)
 		}
-		if val, ok := reply["go_gc_percent"].(float64); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_gc_gogc_percent"], prometheus.GaugeValue, val, nodeID)
+		if val, ok := reply[utils.MetricGCPercent].(float64); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoGCGogcPercent], prometheus.GaugeValue, val, nodeID)
 		}
-		if val, ok := reply["go_mem_limit"].(float64); ok {
-			ch <- prometheus.MustNewConstMetric(c.descs["go_gc_gomemlimit_bytes"], prometheus.GaugeValue, val, nodeID)
+		if val, ok := reply[utils.MetricMemLimit].(float64); ok {
+			ch <- prometheus.MustNewConstMetric(c.descs[promGoGCGomemlimitBytes], prometheus.GaugeValue, val, nodeID)
 		}
 	}
 }

apier/v1/config_it_test.go

@@ -604,7 +604,7 @@ func testConfigSStartEngineCAPSAllocated(t *testing.T) {
 		t.Errorf("Expected %+v , received: %+v ", "CAPSPeakEngine", rply)
 	}
 
-	if _, has := rply[utils.CAPSAllocated]; !has {
+	if _, has := rply[utils.MetricCapsAllocated]; !has {
 		t.Errorf("Expected reply to contain CAPSAllocated , received <%+v>", rply)
 	}
 }
@@ -637,7 +637,7 @@ func testConfigSCAPSPeak(t *testing.T) {
 		t.Error(err)
 	}
 
-	if _, has := rply[utils.CAPSPeak]; !has {
+	if _, has := rply[utils.MetricCapsPeak]; !has {
 		t.Errorf("Expected reply to contain CAPSPeak , received <%+v>", rply)
 	}
 }

cores/metrics.go

@@ -31,6 +31,7 @@ import (
 	"github.com/prometheus/procfs"
 )
 
+// Runtime metrics paths
 const (
 	metricPathGoMaxProcs  = "/sched/gomaxprocs:threads"
 	metricPathGoGCPercent = "/gc/gogc:percent"
@@ -45,19 +46,21 @@ const (
 // different connection types (direct *internal calls vs serialized RPC
 // connections) while aligning with Prometheus' float64-based metric system.
 type StatusMetrics struct {
-	PID             float64         `json:"pid"`
-	GoVersion       string          `json:"go_version"`
-	NodeID          string          `json:"node_id"`
-	Version         string          `json:"version"`
-	Goroutines      float64         `json:"goroutines"`
-	Threads         float64         `json:"threads"`
+	PID        float64 `json:"pid"`
+	GoVersion  string  `json:"go_version"`
+	NodeID     string  `json:"node_id"`
+	Version    string  `json:"version"`
+	Goroutines float64 `json:"goroutines"`
+	Threads    float64 `json:"threads"`
+
 	MemStats        GoMemStats      `json:"mem_stats"`
 	GCDurationStats GCDurationStats `json:"gc_duration_stats"`
 	ProcStats       ProcStats       `json:"proc_stats"`
 	CapsStats       *CapsStats      `json:"caps_stats"`
-	GoMaxProcs      float64         `json:"go_maxprocs"`
-	GoGCPercent     float64         `json:"go_gc_percent"`
-	GoMemLimit      float64         `json:"go_mem_limit"`
+
+	MaxProcs  float64 `json:"maxprocs"`
+	GCPercent float64 `json:"gc_percent"`
+	MemLimit  float64 `json:"mem_limit"`
 }
 
 // toMap converts the StatusMetrics to a map[string]any with all fields.
@@ -67,19 +70,19 @@ func (sm StatusMetrics) toMap(debug bool, timezone string) (map[string]any, erro
 		return sm.toMapCondensed(timezone)
 	}
 	m := map[string]any{
-		"pid":               sm.PID,
-		"go_version":        sm.GoVersion,
-		"node_id":           sm.NodeID,
-		"version":           sm.Version,
-		"goroutines":        sm.Goroutines,
-		"threads":           sm.Threads,
-		"mem_stats":         sm.MemStats.toMap(),
-		"gc_duration_stats": sm.GCDurationStats.toMap(),
-		"proc_stats":        sm.ProcStats.toMap(),
-		"go_maxprocs":       sm.GoMaxProcs,
-		"go_gc_percent":     sm.GoGCPercent,
-		"go_mem_limit":      sm.GoMemLimit,
-		"caps_stats":        sm.CapsStats.toMap(),
+		utils.PID:                     sm.PID,
+		utils.GoVersion:               sm.GoVersion,
+		utils.NodeID:                  sm.NodeID,
+		utils.FieldVersion:            sm.Version,
+		utils.MetricRuntimeGoroutines: sm.Goroutines,
+		utils.MetricRuntimeThreads:    sm.Threads,
+		utils.FieldMemStats:           sm.MemStats.toMap(),
+		utils.FieldGCDurationStats:    sm.GCDurationStats.toMap(),
+		utils.FieldProcStats:          sm.ProcStats.toMap(),
+		utils.MetricRuntimeMaxProcs:   sm.MaxProcs,
+		utils.MetricGCPercent:         sm.GCPercent,
+		utils.MetricMemLimit:          sm.MemLimit,
+		utils.FieldCapsStats:          sm.CapsStats.toMap(),
 	}
 	return m, nil
 }
@@ -88,16 +91,16 @@ func (sm StatusMetrics) toMap(debug bool, timezone string) (map[string]any, erro
 // human-readable values.
 func (sm StatusMetrics) toMapCondensed(timezone string) (map[string]any, error) {
 	m := map[string]any{
-		utils.PID:            sm.PID,
-		utils.GoVersion:      sm.GoVersion,
-		utils.NodeID:         sm.NodeID,
-		utils.VersionLower:   sm.Version,
-		utils.Goroutines:     sm.Goroutines,
-		utils.OpenFiles:      sm.ProcStats.OpenFDs,
-		utils.ResidentMemory: utils.SizeFmt(sm.ProcStats.ResidentMemory, ""),
-		utils.ActiveMemory:   utils.SizeFmt(sm.MemStats.HeapAlloc, ""),
-		utils.SystemMemory:   utils.SizeFmt(sm.MemStats.Sys, ""),
-		utils.OSThreadsInUse: sm.Threads,
+		utils.PID:                      sm.PID,
+		utils.GoVersion:                sm.GoVersion,
+		utils.NodeID:                   sm.NodeID,
+		utils.FieldVersion:             sm.Version,
+		utils.MetricRuntimeGoroutines:  sm.Goroutines,
+		utils.OpenFiles:                sm.ProcStats.OpenFDs,
+		utils.MetricProcResidentMemory: utils.SizeFmt(sm.ProcStats.ResidentMemory, ""),
+		utils.ActiveMemory:             utils.SizeFmt(sm.MemStats.HeapAlloc, ""),
+		utils.SystemMemory:             utils.SizeFmt(sm.MemStats.Sys, ""),
+		utils.OSThreadsInUse:           sm.Threads,
 	}
 
 	startTime, err := utils.ParseTimeDetectLayout(strconv.Itoa(int(sm.ProcStats.StartTime)), timezone)
@@ -111,12 +114,12 @@ func (sm StatusMetrics) toMapCondensed(timezone string) (map[string]any, error)
 	if err != nil {
 		return nil, err
 	}
-	m[utils.CPUTime] = dur.String()
+	m[utils.MetricProcCPUTime] = dur.String()
 
 	if sm.CapsStats != nil {
-		m[utils.CAPSAllocated] = sm.CapsStats.Allocated
+		m[utils.MetricCapsAllocated] = sm.CapsStats.Allocated
 		if sm.CapsStats.Peak != nil {
-			m[utils.CAPSPeak] = *sm.CapsStats.Peak
+			m[utils.MetricCapsPeak] = *sm.CapsStats.Peak
 		}
 	}
 	return m, nil
@@ -149,28 +152,28 @@ type GoMemStats struct {
 
 func (ms GoMemStats) toMap() map[string]any {
 	return map[string]any{
-		"alloc":         ms.Alloc,
-		"total_alloc":   ms.TotalAlloc,
-		"sys":           ms.Sys,
-		"mallocs":       ms.Mallocs,
-		"frees":         ms.Frees,
-		"heap_alloc":    ms.HeapAlloc,
-		"heap_sys":      ms.HeapSys,
-		"heap_idle":     ms.HeapIdle,
-		"heap_inuse":    ms.HeapInuse,
-		"heap_released": ms.HeapReleased,
-		"heap_objects":  ms.HeapObjects,
-		"stack_inuse":   ms.StackInuse,
-		"stack_sys":     ms.StackSys,
-		"mspan_sys":     ms.MSpanSys,
-		"mspan_inuse":   ms.MSpanInuse,
-		"mcache_inuse":  ms.MCacheInuse,
-		"mcache_sys":    ms.MCacheSys,
-		"buckhash_sys":  ms.BuckHashSys,
-		"gc_sys":        ms.GCSys,
-		"other_sys":     ms.OtherSys,
-		"next_gc":       ms.NextGC,
-		"last_gc":       ms.LastGC,
+		utils.MetricMemAlloc:        ms.Alloc,
+		utils.MetricMemTotalAlloc:   ms.TotalAlloc,
+		utils.MetricMemSys:          ms.Sys,
+		utils.MetricMemMallocs:      ms.Mallocs,
+		utils.MetricMemFrees:        ms.Frees,
+		utils.MetricMemHeapAlloc:    ms.HeapAlloc,
+		utils.MetricMemHeapSys:      ms.HeapSys,
+		utils.MetricMemHeapIdle:     ms.HeapIdle,
+		utils.MetricMemHeapInuse:    ms.HeapInuse,
+		utils.MetricMemHeapReleased: ms.HeapReleased,
+		utils.MetricMemHeapObjects:  ms.HeapObjects,
+		utils.MetricMemStackInuse:   ms.StackInuse,
+		utils.MetricMemStackSys:     ms.StackSys,
+		utils.MetricMemMSpanSys:     ms.MSpanSys,
+		utils.MetricMemMSpanInuse:   ms.MSpanInuse,
+		utils.MetricMemMCacheInuse:  ms.MCacheInuse,
+		utils.MetricMemMCacheSys:    ms.MCacheSys,
+		utils.MetricMemBuckHashSys:  ms.BuckHashSys,
+		utils.MetricMemGCSys:        ms.GCSys,
+		utils.MetricMemOtherSys:     ms.OtherSys,
+		utils.MetricMemNextGC:       ms.NextGC,
+		utils.MetricMemLastGC:       ms.LastGC,
 	}
 }
 
@@ -182,9 +185,9 @@ type GCDurationStats struct {
 
 func (s GCDurationStats) toMap() map[string]any {
 	return map[string]any{
-		"quantiles": s.Quantiles,
-		"sum":       s.Sum,
-		"count":     s.Count,
+		utils.MetricGCQuantiles: s.Quantiles,
+		utils.MetricGCSum:       s.Sum,
+		utils.MetricGCCount:     s.Count,
 	}
 }
 
@@ -207,15 +210,15 @@ type ProcStats struct {
 
 func (ps ProcStats) toMap() map[string]any {
 	return map[string]any{
-		"cpu_time":               ps.CPUTime,
-		"max_fds":                ps.MaxFDs,
-		"open_fds":               ps.OpenFDs,
-		"resident_memory":        ps.ResidentMemory,
-		"start_time":             ps.StartTime,
-		"virtual_memory":         ps.VirtualMemory,
-		"max_virtual_memory":     ps.MaxVirtualMemory,
-		"network_receive_total":  ps.NetworkReceiveTotal,
-		"network_transmit_total": ps.NetworkTransmitTotal,
+		utils.MetricProcCPUTime:              ps.CPUTime,
+		utils.MetricProcMaxFDs:               ps.MaxFDs,
+		utils.MetricProcOpenFDs:              ps.OpenFDs,
+		utils.MetricProcResidentMemory:       ps.ResidentMemory,
+		utils.MetricProcStartTime:            ps.StartTime,
+		utils.MetricProcVirtualMemory:        ps.VirtualMemory,
+		utils.MetricProcMaxVirtualMemory:     ps.MaxVirtualMemory,
+		utils.MetricProcNetworkReceiveTotal:  ps.NetworkReceiveTotal,
+		utils.MetricProcNetworkTransmitTotal: ps.NetworkTransmitTotal,
 	}
 }
 
@@ -229,11 +232,13 @@ func (cs *CapsStats) toMap() map[string]any {
 		return nil
 	}
 	return map[string]any{
-		"allocated": cs.Allocated,
-		"peak":      cs.Peak,
+		utils.MetricCapsAllocated: cs.Allocated,
+		utils.MetricCapsPeak:      cs.Peak,
 	}
 }
 
+// computeAppMetrics gathers runtime metrics including memory usage, goroutines,
+// GC stats, and process information for monitoring and diagnostics.
 func computeAppMetrics() (StatusMetrics, error) {
 	vers, err := utils.GetCGRVersion()
 	if err != nil {
@@ -364,9 +369,9 @@ func computeAppMetrics() (StatusMetrics, error) {
 		MemStats:        memStats,
 		GCDurationStats: gcDur,
 		ProcStats:       procStats,
-		GoMaxProcs:      float64(goMaxProcs),
-		GoGCPercent:     float64(goGCPercent),
-		GoMemLimit:      float64(goMemLimit),
+		MaxProcs:        float64(goMaxProcs),
+		GCPercent:       float64(goGCPercent),
+		MemLimit:        float64(goMemLimit),
 	}, nil
 }
 

cores/metrics_test.go

@@ -68,9 +68,9 @@ func TestStatusMetricsToMap(t *testing.T) {
 		GCDurationStats: gcDurationStats,
 		ProcStats:       procStats,
 		CapsStats:       capsStats,
-		GoMaxProcs:      3,
-		GoGCPercent:     100,
-		GoMemLimit:      5555,
+		MaxProcs:        3,
+		GCPercent:       100,
+		MemLimit:        5555,
 	}
 
 	result, err := sm.toMap(true, "UTC")
@@ -78,19 +78,19 @@ func TestStatusMetricsToMap(t *testing.T) {
 		t.Errorf("Unexpected error: %v", err)
 	}
 	expected := map[string]any{
-		"pid":               1234.,
-		"go_version":        "go1.16",
-		"node_id":           "node123",
-		"version":           "v1.0.0",
-		"goroutines":        10.,
-		"threads":           5.,
-		"mem_stats":         memStats.toMap(),
-		"gc_duration_stats": gcDurationStats.toMap(),
-		"proc_stats":        procStats.toMap(),
-		"caps_stats":        capsStats.toMap(),
-		"go_maxprocs":       3.,
-		"go_gc_percent":     100.,
-		"go_mem_limit":      5555.,
+		utils.PID:                     1234.,
+		utils.GoVersion:               "go1.16",
+		utils.NodeID:                  "node123",
+		utils.FieldVersion:            "v1.0.0",
+		utils.MetricRuntimeGoroutines: 10.,
+		utils.MetricRuntimeThreads:    5.,
+		utils.FieldMemStats:           memStats.toMap(),
+		utils.FieldGCDurationStats:    gcDurationStats.toMap(),
+		utils.FieldProcStats:          procStats.toMap(),
+		utils.FieldCapsStats:          capsStats.toMap(),
+		utils.MetricRuntimeMaxProcs:   3.,
+		utils.MetricGCPercent:         100.,
+		utils.MetricMemLimit:          5555.,
 	}
 
 	if !reflect.DeepEqual(result, expected) {

utils/consts.go

@@ -845,7 +845,6 @@ const (
 	MetaDynaprepaid         = "*dynaprepaid"
 	MetaFD                  = "*fd"
 	SortingData             = "SortingData"
-	Count                   = "Count"
 	ProfileID               = "ProfileID"
 	SortedRoutes            = "SortedRoutes"
 	MetaMonthly             = "*monthly"
@@ -972,22 +971,72 @@ const (
 	DNSData               = "Data"
 )
 
-// CoreSv1.Status metrics
+// CoreS metric constants
 const (
+
+	// condensed result fields
 	PID            = "pid"
 	NodeID         = "node_id"
 	GoVersion      = "go_version"
-	VersionLower   = "version"
-	Goroutines     = "goroutines"
 	OSThreadsInUse = "os_threads_in_use"
-	CAPSAllocated  = "caps_allocated"
-	CAPSPeak       = "caps_peak"
 	RunningSince   = "running_since"
 	OpenFiles      = "open_files"
-	CPUTime        = "cpu_time"
 	ActiveMemory   = "active_memory"
 	SystemMemory   = "system_memory"
-	ResidentMemory = "resident_memory"
+
+	FieldVersion         = "version"
+	FieldMemStats        = "mem_stats"
+	FieldGCDurationStats = "gc_duration_stats"
+	FieldProcStats       = "proc_stats"
+	FieldCapsStats       = "caps_stats"
+
+	MetricRuntimeGoroutines = "goroutines"
+	MetricRuntimeThreads    = "threads"
+	MetricRuntimeMaxProcs   = "maxprocs"
+
+	MetricMemAlloc        = "alloc"
+	MetricMemTotalAlloc   = "total_alloc"
+	MetricMemSys          = "sys"
+	MetricMemMallocs      = "mallocs"
+	MetricMemFrees        = "frees"
+	MetricMemHeapAlloc    = "heap_alloc"
+	MetricMemHeapSys      = "heap_sys"
+	MetricMemHeapIdle     = "heap_idle"
+	MetricMemHeapInuse    = "heap_inuse"
+	MetricMemHeapReleased = "heap_released"
+	MetricMemHeapObjects  = "heap_objects"
+	MetricMemStackInuse   = "stack_inuse"
+	MetricMemStackSys     = "stack_sys"
+	MetricMemMSpanSys     = "mspan_sys"
+	MetricMemMSpanInuse   = "mspan_inuse"
+	MetricMemMCacheInuse  = "mcache_inuse"
+	MetricMemMCacheSys    = "mcache_sys"
+	MetricMemBuckHashSys  = "buckhash_sys"
+	MetricMemGCSys        = "gc_sys"
+	MetricMemOtherSys     = "other_sys"
+	MetricMemNextGC       = "next_gc"
+	MetricMemLastGC       = "last_gc"
+	MetricMemLimit        = "mem_limit"
+
+	MetricProcCPUTime              = "cpu_time"
+	MetricProcMaxFDs               = "max_fds"
+	MetricProcOpenFDs              = "open_fds"
+	MetricProcResidentMemory       = "resident_memory"
+	MetricProcStartTime            = "start_time"
+	MetricProcVirtualMemory        = "virtual_memory"
+	MetricProcMaxVirtualMemory     = "max_virtual_memory"
+	MetricProcNetworkReceiveTotal  = "network_receive_total"
+	MetricProcNetworkTransmitTotal = "network_transmit_total"
+
+	MetricGCQuantiles = "quantiles"
+	MetricGCQuantile  = "quantile"
+	MetricGCValue     = "value"
+	MetricGCSum       = "sum"
+	MetricGCCount     = "count"
+	MetricGCPercent   = "gc_percent"
+
+	MetricCapsAllocated = "caps_allocated"
+	MetricCapsPeak      = "caps_peak"
 )
 
 // Migrator Action