Revert "[fuchsia_system_metrics] Remove memory metric. Migrated to memory project."

This reverts commit 1eac0e5efb055ac32b630c9034d81ce3d759e901.

Reason for revert: Roller is broken: https://turquoise-internal-review.googlesource.com/c/integration/+/171596

Original change's description:
> [fuchsia_system_metrics] Remove memory metric. Migrated to memory project.
> 
> Wait until this CL is landed:
> https://fuchsia-review.googlesource.com/c/fuchsia/+/351355/
> 
> Bug: 40088
> 
> Change-Id: I3cb99a70bbad4785650664b27a1a358dc369fbc2

TBR=rudominer@google.com,zmbush@google.com,stevefung@google.com,gracelaw@google.com

Change-Id: Ib40f17c7cfd77eb42783b1dff50cfb4a5a447240
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 40088
diff --git a/fuchsia/fuchsia_system_metrics/metrics.yaml b/fuchsia/fuchsia_system_metrics/metrics.yaml
index d3e3c78..cb4e38d 100644
--- a/fuchsia/fuchsia_system_metrics/metrics.yaml
+++ b/fuchsia/fuchsia_system_metrics/metrics.yaml
@@ -114,6 +114,105 @@
     expiration_date: "2020/01/17"
 
 #####################################################################
+# fuchsia memory_usage
+#
+# For every minute, we log the memory usage in bytes with breakdowns:
+#####################################################################
+- id: 3
+  metric_name: fuchsia_memory_experimental
+  metric_type: MEMORY_USAGE
+  metric_dimensions:
+    - dimension: memory_breakdown
+      event_codes:
+        0: TotalBytes
+        1: UsedBytes
+        2: FreeBytes
+        3: VmoBytes
+        4: KernelFreeHeapBytes
+        5: MmuBytes
+        6: IpcBytes
+        7: KernelTotalHeapBytes
+        8: WiredBytes
+        9: OtherBytes
+  reports:
+      #####################################################################
+      # fuchsia_memory_usage
+      #
+      #####################################################################
+    - report_name: fuchsia_memory_usage_numeric_aggr_experimental
+      id: 490323763 # legacy long report_id
+      report_type: NUMERIC_AGGREGATION
+      percentiles: [5, 10, 90, 95, 99]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, OS, CHANNEL]
+    - report_name: fuchsia_memory_usage_histogram_experimental_2
+      id: 2249350189 # legacy long report_id
+      report_type: INT_RANGE_HISTOGRAM
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, OS, CHANNEL]
+      int_buckets:
+        linear:
+          floor: 0
+          num_buckets: 154
+          step_size: 10485760 # 10 MB
+  meta_data:
+    max_release_stage: GA
+    expiration_date: "2020/10/25"
+
+#####################################################################
+# fuchsia memory_usage with up time breakdown
+#
+# For every minute, we log the memory usage in bytes with breakdowns:
+#####################################################################
+- id: 4
+  metric_name: fuchsia_memory_experimental_2
+  metric_type: MEMORY_USAGE
+  metric_dimensions:
+    - dimension: memory_breakdown
+      event_codes:
+        0: TotalBytes
+        1: UsedBytes
+        2: FreeBytes
+        3: VmoBytes
+        4: KernelFreeHeapBytes
+        5: MmuBytes
+        6: IpcBytes
+        7: KernelTotalHeapBytes
+        8: WiredBytes
+        9: OtherBytes
+    - dimension: time_since_boot
+      event_codes:
+        0: Up
+        1: UpOneMinute
+        2: UpThirtyMinutes
+        3: UpOneHour
+        4: UpSixHours
+        5: UpTwelveHours
+        6: UpOneDay
+        7: UpTwoDays
+        8: UpThreeDays
+        9: UpSixDays
+  reports:
+      #####################################################################
+      # fuchsia_memory_usage
+      #####################################################################
+    - report_name: fuchsia_memory_usage_numeric_aggr_experimental
+      id: 490323763 # legacy long report_id
+      report_type: NUMERIC_AGGREGATION
+      percentiles: [5, 10, 90, 95, 99]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, OS, CHANNEL]
+    - report_name: fuchsia_memory_usage_histogram_experimental
+      id: 57178942 # legacy long report_id
+      report_type: INT_RANGE_HISTOGRAM
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, OS, CHANNEL]
+      int_buckets:
+        linear:
+          floor: 0
+          num_buckets: 154
+          step_size: 10485760 # 10 MB
+  meta_data:
+    max_release_stage: GA
+    expiration_date: "2020/10/25"
+
+#####################################################################
 # ****** WILL DEPRECATE. Use id 8 below instead. ******
 # fuchsia CPU% * 100 averaged over all cores taken per sec
 #