gcp: revert fields naming

In elastic#27231 I discovered that all `gcp` metricsets do not respect the
Beats naming conventions.

In order to preserve consistency across metricset this commit reverts
the changes that aligned the newly added metrics to naming conventions.

x-pack/metricbeat/module/gcp/gke/_meta/fields.yml

@@ -9,58 +9,58 @@
     - name: cpu
       type: group
       fields:
-      - name: core_usage_time.sec
+      - name: core_usage_time.value
         type: double
         description: Cumulative CPU usage on all cores used by the container in seconds. Sampled every 60 seconds.
       - name: limit_cores.value
         type: double
         description: CPU cores limit of the container. Sampled every 60 seconds.
-      - name: limit_utilization.pct
+      - name: limit_utilization.value
         type: double
         description: The fraction of the CPU limit that is currently in use on the instance. This value cannot exceed 1 as usage cannot exceed the limit. Sampled every 60 seconds. After sampling, data is not visible for up to 240 seconds.
       - name: request_cores.value
         type: double
         description: Number of CPU cores requested by the container. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-      - name: request_utilization.pct
+      - name: request_utilization.value
         type: double
         description: The fraction of the requested CPU that is currently in use on the instance. This value can be greater than 1 as usage can exceed the request. Sampled every 60 seconds. After sampling, data is not visible for up to 240 seconds.
     - name: ephemeral_storage
       type: group
       fields:
-      - name: limit.bytes
+      - name: limit_bytes.value
         type: long
         description: Local ephemeral storage limit in bytes. Sampled every 60 seconds.
-      - name: request.bytes
+      - name: request_bytes.value
         type: long
         description: Local ephemeral storage request in bytes. Sampled every 60 seconds.
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Local ephemeral storage usage in bytes. Sampled every 60 seconds.
     - name: memory
       type: group
       fields:
-      - name: limit.bytes
+      - name: limit_bytes.value
         type: long
         description: Memory limit of the container in bytes. Sampled every 60 seconds.
-      - name: limit_utilization.pct
+      - name: limit_utilization.value
         type: double
         description: The fraction of the memory limit that is currently in use on the instance. This value cannot exceed 1 as usage cannot exceed the limit. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-      - name: page_fault.count
+      - name: page_fault_count.value
         type: long
         description: Number of page faults, broken down by type, major and minor.
-      - name: request.bytes
+      - name: request_bytes.value
         type: long
         description: Memory request of the container in bytes. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-      - name: request_utilization.pct
+      - name: request_utilization.value
         type: double
         description: The fraction of the requested memory that is currently in use on the instance. This value can be greater than 1 as usage can exceed the request. Sampled every 60 seconds. After sampling, data is not visible for up to 240 seconds.
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Memory usage in bytes. Sampled every 60 seconds.
-    - name: restart.count
+    - name: restart_count.value
       type: long
       description: Number of times the container has restarted. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-    - name: uptime.sec
+    - name: uptime.value
       type: double
       description: Time in seconds that the container has been running. Sampled every 60 seconds.
   - name: node
@@ -72,10 +72,10 @@
       - name: allocatable_cores.value
         type: double
         description: Number of allocatable CPU cores on the node. Sampled every 60 seconds.
-      - name: allocatable_utilization.pct
+      - name: allocatable_utilization.value
         type: double
         description: The fraction of the allocatable CPU that is currently in use on the instance. Sampled every 60 seconds. After sampling, data is not visible for up to 240 seconds.
-      - name: core_usage_time.sec
+      - name: core_usage_time.value
         type: double
         description: Cumulative CPU usage on all cores used on the node in seconds. Sampled every 60 seconds.
       - name: total_cores.value
@@ -84,7 +84,7 @@
     - name: ephemeral_storage
       type: group
       fields:
-      - name: allocatable.bytes
+      - name: allocatable_bytes.value
         type: long
         description: Local ephemeral storage bytes allocatable on the node. Sampled every 60 seconds.
       - name: inodes_free.value
@@ -93,34 +93,34 @@
       - name: inodes_total.value
         type: long
         description: Total number of inodes on local ephemeral storage. Sampled every 60 seconds.
-      - name: total.bytes
+      - name: total_bytes.value
         type: long
         description: Total ephemeral storage bytes on the node. Sampled every 60 seconds.
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Local ephemeral storage bytes used by the node. Sampled every 60 seconds.
     - name: memory
       type: group
       fields:
-      - name: allocatable.bytes
+      - name: allocatable_bytes.value
         type: long
         description: Cumulative memory bytes used by the node. Sampled every 60 seconds.
-      - name: allocatable_utilization.pct
+      - name: allocatable_utilization.value
         type: double
         description: The fraction of the allocatable memory that is currently in use on the instance. This value cannot exceed 1 as usage cannot exceed allocatable memory bytes. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-      - name: total.bytes
+      - name: total_bytes.value
         type: long
         description: Number of bytes of memory allocatable on the node. Sampled every 60 seconds.
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Cumulative memory bytes used by the node. Sampled every 60 seconds.
     - name: network
       type: group
       fields:
-      - name: received_bytes.count
+      - name: received_bytes_count.value
         type: long
         description: Cumulative number of bytes received by the node over the network. Sampled every 60 seconds.
-      - name: sent_bytes.count
+      - name: sent_bytes_count.value
         type: long
         description: Cumulative number of bytes transmitted by the node over the network. Sampled every 60 seconds.
     - name: pid_limit.value
@@ -135,13 +135,13 @@
     - name: cpu
       type: group
       fields:
-      - name: core_usage_time.sec
+      - name: core_usage_time.value
         type: double
         description: Cumulative CPU usage on all cores used by the node level system daemon in seconds. Sampled every 60 seconds.
     - name: memory
       type: group
       fields:
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Memory usage by the system daemon in bytes. Sampled every 60 seconds.
   - name: pod
@@ -150,21 +150,21 @@
     - name: network
       type: group
       fields:
-      - name: received_bytes.count
+      - name: received_bytes_count.value
         type: long
         description: Cumulative number of bytes received by the pod over the network. Sampled every 60 seconds.
-      - name: sent_bytes.count
+      - name: sent_bytes_count.value
         type: long
         description: Cumulative number of bytes transmitted by the pod over the network. Sampled every 60 seconds.
     - name: volume
       type: group
       fields:
-      - name: total.bytes
+      - name: total_bytes.value
         type: long
         description: Total number of disk bytes available to the pod. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.
-      - name: used.bytes
+      - name: used_bytes.value
         type: long
         description: Number of disk bytes used by the pod. Sampled every 60 seconds.
-      - name: utilization.pct
+      - name: utilization.value
         type: double
         description: The fraction of the volume that is currently being used by the instance. This value cannot be greater than 1 as usage cannot exceed the total available volume space. Sampled every 60 seconds. After sampling, data is not visible for up to 120 seconds.