[system_metrics] Add ARCH field to more metrics

Save the ARCH field of system_profile, so that we can write queries that
split a product by architecture.

This change adds the ARCH field to fuchsia_up_ping and
fuchsia_lifetime_events.

Bug: 45933
Change-Id: Ibd285fa1b86a25d5d8e7f0520ccf3628e8998263
diff --git a/fuchsia/fuchsia_system_metrics/metrics.yaml b/fuchsia/fuchsia_system_metrics/metrics.yaml
index c5b1a38..1094392 100644
--- a/fuchsia/fuchsia_system_metrics/metrics.yaml
+++ b/fuchsia/fuchsia_system_metrics/metrics.yaml
@@ -49,7 +49,7 @@
       local_privacy_noise_level: NONE
       window_size:
         - 1
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, CHANNEL]
       #####################################################################
       # fuchsia_up_ping
       #
@@ -62,7 +62,7 @@
       id: 1074068063 # legacy long report_id
       report_type: SIMPLE_OCCURRENCE_COUNT
       local_privacy_noise_level: NONE
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, CHANNEL]
   meta_data:
     max_release_stage: GA
     expiration_date: "2020/01/17"
@@ -93,7 +93,7 @@
       id: 14219118 # legacy long report_id
       report_type: SIMPLE_OCCURRENCE_COUNT
       local_privacy_noise_level: NONE
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, CHANNEL]
 
       #####################################################################
       # fuchsia_unique_device_lifetime_event_counts
@@ -108,7 +108,7 @@
       local_privacy_noise_level: NONE
       window_size:
         - 1
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
+      system_profile_field: [BOARD_NAME, PRODUCT_NAME, ARCH, SYSTEM_VERSION, CHANNEL]
   meta_data:
     max_release_stage: GA
     expiration_date: "2020/01/17"