Enhancement - Add metric for Kafka receiver unmarshal errors

[thmshmm]

Component(s)

receiver/kafka

Is your feature request related to a problem? Please describe.

The current implementation of the Kafka receiver logs unmarshal errors, but lacks a corresponding metric. This enhancement request proposes the addition of a metric to track and expose unmarshal errors.

Benefits:

• additional metric allows for real-time monitoring and alerting on unmarshal errors
• the metrics can be used to record historical data

Describe the solution you'd like

For each unmarshal error a counter should be increased. There should be dedicated metrics for logs, metrics and traces.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/kafka: @pavolloffay @MovieStoreGuy

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