Adopt config to use policy based resampler configuration

Entire-Checkpoint: 7536f551d548

internal/config/config.go

@@ -106,12 +106,10 @@ type NodeStateRetention struct {
 }
 
 type ResampleConfig struct {
-	// Minimum number of points to trigger resampling of data
-	MinimumPoints int `json:"minimum-points"`
-	// Array of resampling target resolutions, in seconds; Example: [600,300,60]
-	Resolutions []int `json:"resolutions"`
-	// Trigger next zoom level at less than this many visible datapoints
-	Trigger int `json:"trigger"`
+	// Default resample policy when no user preference is set ("low", "medium", "high")
+	DefaultPolicy string `json:"default-policy"`
+	// Default resample algorithm when no user preference is set ("lttb", "average", "simple")
+	DefaultAlgo string `json:"default-algo"`
 	// Policy-derived target point count (set dynamically from user preference, not from config.json)
 	TargetPoints int `json:"targetPoints,omitempty"`
 }
@@ -157,7 +155,24 @@ func Init(mainConfig json.RawMessage) {
 		cclog.Abortf("Config Init: Could not decode config file '%s'.\nError: %s\n", mainConfig, err.Error())
 	}
 
-	if Keys.EnableResampling != nil && Keys.EnableResampling.MinimumPoints > 0 {
-		resampler.SetMinimumRequiredPoints(Keys.EnableResampling.MinimumPoints)
+	if Keys.EnableResampling != nil {
+		policy := Keys.EnableResampling.DefaultPolicy
+		if policy == "" {
+			policy = "medium"
+		}
+		resampler.SetMinimumRequiredPoints(targetPointsForPolicy(policy))
+	}
+}
+
+func targetPointsForPolicy(policy string) int {
+	switch policy {
+	case "low":
+		return 200
+	case "medium":
+		return 500
+	case "high":
+		return 1000
+	default:
+		return 500
 	}
 }

internal/config/schema.go

@@ -92,23 +92,17 @@ var configSchema = `
       "description": "Enable dynamic zoom in frontend metric plots.",
       "type": "object",
       "properties": {
-        "minimum-points": {
-          "description": "Minimum points to trigger resampling of time-series data.",
-          "type": "integer"
+        "default-policy": {
+          "description": "Default resample policy when no user preference is set.",
+          "type": "string",
+          "enum": ["low", "medium", "high"]
         },
-        "trigger": {
-          "description": "Trigger next zoom level at less than this many visible datapoints.",
-          "type": "integer"
-        },
-        "resolutions": {
-          "description": "Array of resampling target resolutions, in seconds.",
-          "type": "array",
-          "items": {
-            "type": "integer"
-          }
+        "default-algo": {
+          "description": "Default resample algorithm when no user preference is set.",
+          "type": "string",
+          "enum": ["lttb", "average", "simple"]
         }
-      },
-      "required": ["trigger", "resolutions"]
+      }
     },
     "api-subjects": {
       "description": "NATS subjects configuration for subscribing to job and node events.",