Adapt k8s prometheus requests resources (#1104) (#1144)

Signed-off-by: Julien Tinguely <julien.tinguely@digitalasset.com>

Author: julientinguely-da

cluster/expected/infra/expected.json

@@ -2701,8 +2701,8 @@
             "remoteWriteDashboards": true,
             "resources": {
               "requests": {
-                "cpu": "4",
-                "memory": "24Gi"
+                "cpu": "2",
+                "memory": "8Gi"
               }
             },
             "retention": "1y",

cluster/pulumi/infra/src/observability.ts

@@ -278,8 +278,8 @@ export function configureObservability(dependsOn: pulumi.Resource[] = []): pulum
             retentionSize: infraConfig.prometheus.retentionSize,
             resources: {
               requests: {
-                memory: clusterProdLike ? (!clusterIsResetPeriodically ? '24Gi' : '6Gi') : '4Gi',
-                cpu: clusterProdLike ? (!clusterIsResetPeriodically ? '4' : '2') : '1',
+                memory: clusterProdLike ? (!clusterIsResetPeriodically ? '8Gi' : '3Gi') : '2Gi',
+                cpu: clusterProdLike ? (!clusterIsResetPeriodically ? '2' : '1') : '0.5',
               },
             },
             logFormat: 'json',