[BUG] config key otlp_config.metrics.sums.initial_cumulative_monotonic_value is unknown

[piotr1212]

Upgrade from agent 7.52.1 to 7.53.0 I got the following log message:

 (pkg/util/log/log.go:871 in func1) | config key otlp_config.metrics.sums.initial_cumulative_monotonic_value is unknown

I don't see any deprecation notices or breaking changes in the changelog. The code still seems to support this configuration. We need this feature. The otlp section from our config:

otlp_config:
  metrics:
    resource_attributes_as_tags: true
    sums:
      initial_cumulative_monotonic_value: auto
  receiver:
    protocols:
      grpc:
        endpoint: 127.0.0.1:4317

Agent Environment
Agent 7.53.0 - Commit: 0eec38d - Serialization version: v5.0.111 - Go version: go1.21.9

on Ubuntu

Describe what happened:
config key not accepted

Describe what you expected:
config key to be accepted

Steps to reproduce the issue:
Set otlp_config.metrics.sums.initial_cumulative_monotonic_value in the config of agent 7.53 or higher and start it. Notice log warning about config key unknonw

Additional environment details (Operating System, Cloud provider, etc):
Ubuntu

[ankitpatel96]

Hey! We'll be fixing this in #27910. Thanks for the report!