Merged PR 748532: Enable data center wide ephemeral cache for bxl linux validation

Let's dogfood the data center wide flavor of the ephemeral cache. Use the ephemeral cache as well for the ptrace validation (with a different universe, just to keep those two validations from interacting with each other)

.azdo/linux/job-ptrace.yml

@@ -45,33 +45,19 @@ jobs:
       set -euo pipefail
       mkdir -p Out
       tee Out/CacheConfig.json << EOF
-      {
-      "RemoteIsReadOnly": false,
-      "SkipDeterminismRecovery":  true,
-      "RemoteConstructionTimeoutMilliseconds":  10000,
-      "Assembly":  "BuildXL.Cache.VerticalAggregator",
-      "Type":  "BuildXL.Cache.VerticalAggregator.VerticalCacheAggregatorFactory",
-      "RemoteCache":  {
-                          "CacheServiceFingerprintEndpoint":  "https://mseng.artifacts.visualstudio.com/DefaultCollection",
-                          "RequiredContentKeepUntilHours":  1,
-                          "Assembly":  "BuildXL.Cache.BuildCacheAdapter",
-                          "CacheServiceContentEndpoint":  "https://mseng.vsblob.visualstudio.com/DefaultCollection",
-                          "Type":  "BuildXL.Cache.BuildCacheAdapter.BuildCacheFactory",
-                          "CacheLogPath":  "[BuildXLSelectedLogPath].Remote.log",
-                          "CacheId":  "L3Cache",
-                          "CacheNamespace":  "BuildXLSelfhost.Linux",
-                          "UseBlobContentHashLists":  true
-                      },
-      "LocalCache":  {
-                        "MaxCacheSizeInMB":  20240,
-                        "Assembly":  "BuildXL.Cache.MemoizationStoreAdapter",
-                        "UseStreamCAS":  true,
-                        "Type":  "BuildXL.Cache.MemoizationStoreAdapter.MemoizationStoreCacheFactory",
-                        "CacheLogPath":  "[BuildXLSelectedLogPath]",
-                        "CacheRootPath":  "[BuildXLSelectedRootPath]",
-                        "CacheId":  "SelfhostCS2L1",
-                        "UseRocksDbMemoizationStore":  true
-                    }
+       {
+          "RetentionPolicyInDays":  6,
+          "CacheSizeMb":  20240,
+          "Type":  "BuildXL.Cache.MemoizationStoreAdapter.EphemeralCacheFactory",
+          "DatacenterWide":  true,
+          "LeaderMachineName":  "[BuildXLSelectedLeader]",
+          "CacheRootPath":  "[BuildXLSelectedRootPath]",
+          "CacheId":  "L1L2L3Cache",
+          "Universe":  "bxlselfhostptrace",
+          "CacheLogPath":  "[BuildXLSelectedLogPath]",
+          "Assembly":  "BuildXL.Cache.MemoizationStoreAdapter",
+          "StorageAccountEndpoint": "https://l3bxlselfhost.blob.core.windows.net",
+          "ManagedIdentityId": "eb694749-b1d6-45bc-b7af-2bd81603968a"
       }
       EOF
     displayName: Write cache config file

.azdo/linux/job-selfhost.yml

@@ -135,7 +135,7 @@ jobs:
           "RetentionPolicyInDays":  6,
           "CacheSizeMb":  20240,
           "Type":  "BuildXL.Cache.MemoizationStoreAdapter.EphemeralCacheFactory",
-          "DatacenterWide":  false,
+          "DatacenterWide":  true,
           "LeaderMachineName":  "[BuildXLSelectedLeader]",
           "CacheRootPath":  "[BuildXLSelectedRootPath]",
           "CacheId":  "L1L2L3Cache",