[Draft] SPL-290976: KVService controller flow for deployment

[sgontla]

• adding controller flow

Description

What does this PR have in it?

Key Changes

Highlight the updates in specific files

Testing and Verification

KVService deployment comes up, but pod fails at this time, which is expected, as we need to bring in other supporting changes like the kvservice config in single tenant mode, and also needs db connectivity for the probes to succeed:

sgontla@sgk8s:~/specs$
NAME                                     READY   STATUS             RESTARTS       AGE
splunk-demo-kvservice-57dd65566f-c27jw   0/1     CrashLoopBackOff   6 (110s ago)   7m33s
splunk-demo-kvservice-57dd65566f-sbtbn   0/1     CrashLoopBackOff   6 (117s ago)   7m33s
splunk-demo-kvservice-57dd65566f-xzcnh   0/1     CrashLoopBackOff   6 (116s ago)   7m33s
sgontla@sgk8s:~/specs$

sgontla@sgk8s:~/specs$ k logs -f splunk-demo-kvservice-57dd65566f-c27jw
Service type is set to:  KvsCsp
{"level":"INFO","time":"2026-02-03T06:40:34.243Z","location":"restapi/configure_kvstore.go:124","message":"Starting service","service":"kvstore","hostname":"splunk-demo-kvservice-57dd65566f-c27jw","component":"kvstore-startup","requestId":"69819862b3e9ff0b298d0a1f","branch":"master","commit":"0.12.578","buildTime":"2026-01-13T03:00:12Z"}
{"level":"INFO","time":"2026-02-03T06:40:34.243Z","location":"tracer/tracer.go:18","message":"No distributed tracer enabled","service":"kvstore","hostname":"splunk-demo-kvservice-57dd65566f-c27jw","component":"kvstore-startup","requestId":"69819862b3e9ff0b298d0a1f"}
{"level":"FATAL","time":"2026-02-03T06:40:34.243Z","location":"cfg/config.go:466","message":"Missing required environment variable","service":"kvstore","hostname":"splunk-demo-kvservice-57dd65566f-c27jw","envVariable":"KVSERVICE_DB_SIZECHECKINTERVAL_SECONDS","error":"configuration error","callstack":"cd.splunkdev.com/core-services/kvstore/kvstore/cfg.GetenvRequired\n\t/home/sgontla/git/KVService/kvstore/kvstore/cfg/config.go:466\ncd.splunkdev.com/core-services/kvstore/kvstore/cfg.GetenvRequiredInt64\n\t/home/sgontla/git/KVService/kvstore/kvstore/cfg/config.go:479\ncd.splunkdev.com/core-services/kvstore/kvstore/cfg.UnmarshalWithPostgresVersion\n\t/home/sgontla/git/KVService/kvstore/kvstore/cfg/unmarshal.go:79\ncd.splunkdev.com/core-services/kvstore/kvstore/cfg.Unmarshal\n\t/home/sgontla/git/KVService/kvstore/kvstore/cfg/unmarshal.go:20\ncd.splunkdev.com/core-services/kvstore/kvstore/cfg.LoadCoreConfig\n\t/home/sgontla/git/KVService/kvstore/kvstore/cfg/config.go:376\ncd.splunkdev.com/core-services/kvstore/restapi.configureAPI\n\t/home/sgontla/git/KVService/kvstore/restapi/configure_kvstore.go:164\ncd.splunkdev.com/core-services/kvstore/restapi.(*Server).ConfigureAPI\n\t/home/sgontla/git/KVService/kvstore/restapi/server.go:59\nmain.main\n\t/home/sgontla/git/KVService/kvstore/cmd/kvstore-server/main.go:51\nruntime.main\n\t/home/sgontla/myGoProjects/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.4.linux-amd64/src/runtime/proc.go:283"}

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PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.

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