Change TPU Metrics Source for Autoscaling (#770)

first commit

Author: Bslabe123

modules/jetstream-maxtext-deployment/templates/custom-metrics-stackdriver-adapter/hpa.jetstream.yaml.tftpl

@@ -24,7 +24,11 @@ spec:
   - type: External
     external:
       metric:
-        name: kubernetes.io|node|accelerator|${rule.target_query}
+        name: prometheus.googleapis.com|${rule.target_query}|gauge 
+        selector:
+          matchLabels:
+            metric.labels.container: jetstream-http
+            metric.labels.exported_namespace: default
       target:
         type: AverageValue
         averageValue: ${rule.average_value_target}

modules/jetstream-maxtext-deployment/templates/prometheus-adapter/values.yaml.tftpl

@@ -29,10 +29,10 @@ rules:
       matches: ""
       as: "jetstream_slots_used_percentage"
     metricsQuery: avg(<<.Series>>{<<.LabelMatchers>>,cluster="${cluster_name}"})
-  - seriesQuery: 'kubernetes_io:node_accelerator_memory_used'
+  - seriesQuery: 'memory_used'
     resources:
       template: <<.Resource>>
     name:
       matches: ""
       as: "memory_used_percentage"
-    metricsQuery: avg(kubernetes_io:node_accelerator_memory_used{cluster_name="${cluster_name}"}) / avg(kubernetes_io:node_accelerator_memory_total{cluster_name="${cluster_name}"})
+    metricsQuery: avg(memory_used{cluster="${cluster_name}",exported_namespace="default",container="jetstream-http"}) / avg(memory_total{cluster="${cluster_name}",exported_namespace="default",container="jetstream-http"})