improve relabel example

Author: marcsanmi

examples/language-sdk-instrumentation/golang-push/rideshare-alloy/config.alloy

@@ -7,36 +7,42 @@ pyroscope.receive_http "default" {
 }
 
 pyroscope.relabel "filter_profiles" {
-    // Convert region to datacenter
+    // Group regions into geographical areas for better aggregation
     rule {
         action = "replace"
         source_labels = ["region"]
-        target_label = "datacenter"
+        target_label = "geo_area"
+        regex = "(us-.*)"
+        replacement = "americas"
     }
-
-    // Add environment label
-    rule {
-        action = "replace"
-        target_label = "environment"
-        replacement = "demo"
-    }
-
-    // Add component label based on application name
     rule {
         action = "replace"
-        source_labels = ["__name__"]
-        target_label = "component"
-        regex = "ride-sharing-app.*"
-        replacement = "backend"
+        source_labels = ["region"]
+        target_label = "geo_area"
+        regex = "(eu-.*)"
+        replacement = "emea"
     }
     rule {
         action = "replace"
-        source_labels = ["__name__"]
-        target_label = "component"
-        regex = "load-generator.*"
-        replacement = "load-generator"
+        source_labels = ["region"]
+        target_label = "geo_area"
+        regex = "(ap-.*)"
+        replacement = "apac"
     }
 
+    // Example: Sample profiles by service_name (drop 30% of services)
+    // rule {
+    //     action = "hashmod"
+    //     source_labels = ["service_name"]
+    //     target_label = "__tmp_hash"
+    //     modulus = 10
+    //}
+    // rule {
+    //     action = "drop"
+    //     source_labels = ["__tmp_hash"]
+    //     regex = "^(0|1|2)$"  // Drop profiles from services that hash to 0-2
+    // }
+
     forward_to = [pyroscope.write.backend.receiver]
 }