[receiver/oracledb] Drop oracledb.process.cpu.time (source v$sysstat OS CPU stats are always 0)

OS System/User time used require timed_os_statistics (off by default, expensive,
unsettable on RDS, absent on Windows) and read 0 even under load on 19c/Linux.
DB CPU is already covered by oracledb.cpu_time; host CPU is V$OSSTAT (#48459).

Author: rluidash

.chloggen/feat_add-oracledb-session-jvm-os-metrics.yaml

@@ -18,8 +18,8 @@ issues: [49065]
 subtext: |
   Adds oracledb.session.waits and oracledb.session.wait.time (attribute oracledb.session.wait.state),
   oracledb.session.stored_procedure.usage, oracledb.jvm.memory.used, oracledb.jvm.memory.committed,
-  oracledb.jvm.memory.live, oracledb.process.cpu.time (attribute cpu.mode), and oracledb.os.swaps.
-  All are disabled by default and add no new database queries.
+  oracledb.jvm.memory.live, and oracledb.os.swaps. All are disabled by default and add no new
+  database queries.
 
 # If your change doesn't affect end users or the exported elements of any package,
 # you should instead start your pull request title with [chore] or use the "Skip Changelog" label.

receiver/oracledbreceiver/documentation.md

@@ -523,20 +523,6 @@ Number of writes directly to disk, bypassing the buffer cache
 | ---- | ----------- | ---------- | ----------------------- | --------- | --------- |
 | {writes} | Sum | Int | Cumulative | true | Development |
 
-### oracledb.process.cpu.time
-
-Cumulative CPU time consumed by the Oracle server and background processes, in seconds (converted from centiseconds), as accounted by Oracle. Sourced from v$sysstat names OS System time used (cpu.mode=system) and OS User time used (cpu.mode=user). Mirrors semconv process.cpu.time; reported from Oracle's own process accounting rather than a host/process collector.
-
-| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic | Stability |
-| ---- | ----------- | ---------- | ----------------------- | --------- | --------- |
-| s | Sum | Double | Cumulative | true | Development |
-
-#### Attributes
-
-| Name | Description | Values | Requirement Level | Semantic Convention |
-| ---- | ----------- | ------ | ----------------- | ------------------- |
-| cpu.mode | The mode in which the CPU time was consumed, as accounted by Oracle. | Str: ``system``, ``user`` | Recommended | - |
-
 ### oracledb.queries_parallelized
 
 Number of SELECT statements executed in parallel

receiver/oracledbreceiver/internal/metadata/config.schema.yaml

@@ -313,13 +313,6 @@ $defs:
           enabled:
             type: boolean
             default: false
-      oracledb.process.cpu.time:
-        description: "OracledbProcessCPUTimeMetricConfig provides config for the oracledb.process.cpu.time metric."
-        type: object
-        properties:
-          enabled:
-            type: boolean
-            default: false
       oracledb.processes.limit:
         description: "OracledbProcessesLimitMetricConfig provides config for the oracledb.processes.limit metric."
         type: object