fix(metrics): absolute to incremental histogram conversion

[dd-sebastien-lb]

Summary

This PR aims to provide a solution to issue #24415.

Vector configuration

How did you test this PR?

The issue describe an error occurring only due a race condition, I was not able to reproduce the race with the config. I mainly added an additional check and the below config was working as expected.

Vector config used:

data_dir: "/tmp/vector-demo"

# Generate demo syslog-formatted logs every second
sources:
  demo_logs:
    type: demo_logs
    format: syslog
    interval: 1

  internal_metrics:
    type: internal_metrics
    scrape_interval_secs: 5

transforms:
  parse_and_enrich:
    type: remap
    inputs:
      - demo_logs
    source: |
      . = parse_syslog!(string!(.message))
      .service = "vector-demo"

sinks:
  console_logs:
    type: console
    inputs:
      - parse_and_enrich
    encoding:
      codec: json
      json:
        pretty: true

  console_metrics:
    type: console
    inputs:
      - internal_metrics
    encoding:
      codec: json
      json:
        pretty: true 

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Closes: Panic in DatadogMetricsSink: "attempt to subtract with overflow" #24415
• Related: Panic in DatadogMetricsSink: "attempt to subtract with overflow" #24415

Notes

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[dd-sebastien-lb]

I have read the CLA Document and I hereby sign the CLA

[bruceg]

LGTM

[thomasqueirozb]

Thanks!