chore: added memory limit metrics (#1020)

Author: RRashmit

internal/collector/otelcol.tmpl

@@ -25,6 +25,9 @@ receivers:
       {{- end }}
       {{- if .Receivers.HostMetrics.Scrapers.Memory }}
       memory:
+        metrics:
+          system.memory.limit:
+            enabled: true
       {{- end }}
       {{- if .Receivers.HostMetrics.Scrapers.Network }}
       network:

test/config/collector/test-opentelemetry-collector-agent.yaml

@@ -12,6 +12,9 @@ receivers:
       disk:
       filesystem:
       memory:
+        metrics:
+          system.memory.limit:
+            enabled: true
       network:
   otlp/0:
     protocols:

test/mock/collector/grafana/provisioning/dashboards/host-metrics.json

@@ -613,6 +613,105 @@
             ],
             "title": "System CPU Logical Count",
             "type": "timeseries"
+        },
+        {
+            "datasource": {
+                "type": "prometheus",
+                "uid": "otel-prometheus-scraper"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "color": {
+                        "mode": "palette-classic"
+                    },
+                    "custom": {
+                        "axisBorderShow": false,
+                        "axisCenteredZero": false,
+                        "axisColorMode": "text",
+                        "axisLabel": "",
+                        "axisPlacement": "auto",
+                        "barAlignment": 0,
+                        "drawStyle": "line",
+                        "fillOpacity": 0,
+                        "gradientMode": "none",
+                        "hideFrom": {
+                            "legend": false,
+                            "tooltip": false,
+                            "viz": false
+                        },
+                        "insertNulls": false,
+                        "lineInterpolation": "linear",
+                        "lineWidth": 1,
+                        "pointSize": 5,
+                        "scaleDistribution": {
+                            "type": "linear"
+                        },
+                        "showPoints": "auto",
+                        "spanNulls": false,
+                        "stacking": {
+                            "group": "A",
+                            "mode": "none"
+                        },
+                        "thresholdsStyle": {
+                            "mode": "off"
+                        }
+                    },
+                    "mappings": [],
+                    "thresholds": {
+                        "mode": "absolute",
+                        "steps": [
+                            {
+                                "color": "green",
+                                "value": null
+                            },
+                            {
+                                "color": "red",
+                                "value": 80
+                            }
+                        ]
+                    }
+                },
+                "overrides": []
+            },
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 0,
+                "y": 8
+            },
+            "id": 8,
+            "options": {
+                "legend": {
+                    "calcs": [],
+                    "displayMode": "list",
+                    "placement": "bottom",
+                    "showLegend": true
+                },
+                "tooltip": {
+                    "mode": "single",
+                    "sort": "none"
+                }
+            },
+            "targets": [
+                {
+                    "datasource": {
+                        "type": "prometheus",
+                        "uid": "otel-prometheus-scraper"
+                    },
+                    "disableTextWrap": false,
+                    "editorMode": "builder",
+                    "expr": "system_memory_limit",
+                    "fullMetaSearch": false,
+                    "includeNullMetadata": true,
+                    "instant": false,
+                    "legendFormat": "__auto",
+                    "range": true,
+                    "refId": "A",
+                    "useBackend": false
+                }
+            ],
+            "title": "System Memory Limit",
+            "type": "timeseries"
         }
     ],
     "refresh": "",