aws_ec2_metadata performs network initialization in build()

[pront]

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Problem

aws_ec2_metadata currently performs network-dependent work in TransformConfig::build().

Today that includes:

• creating the HTTP client
• attempting an initial metadata refresh
• spawning the background refresh task

PR #25161: This makes it an exception for vector validate --no-environment, since normal transform build() cannot be used safely for this transform without touching the environment.

Configuration

data_dir: "${VECTOR_DATA_DIR}"

sources:
  in:
    type: demo_logs
    format: shuffle
    lines:
      - log

transforms:
  meta:
    type: aws_ec2_metadata
    inputs:
      - in
    endpoint: "http://127.0.0.1:9"

sinks:
  out:
    type: blackhole
    inputs:
      - meta

Version

0.54

Debug Output

$ vector validate aws/ec2_meta.yaml
√ Loaded ["/Users/pavlos.rontidis/RustroverProjects/vector/pront/configs/aws/ec2_meta.yaml"]
2026-04-10T14:59:34.187345Z  WARN transform{component_kind="transform" component_id=meta component_type=aws_ec2_metadata}: vector::internal_events::http_client: HTTP error. error=error trying to connect: tcp connect error: Connection refused (os error 61) error_type="request_failed" stage="processing"

Component errors
----------------
x Transform "meta": Unable to fetch metadata authentication token: Failed to make HTTP(S) request: error trying to connect: tcp connect error: Connection refused (os error 61).

--------
$ vector validate --no-environment /Users/pavlos.rontidis/RustroverProjects/vector/pront/configs/aws/ec2_meta.yaml
√ Loaded ["/Users/pavlos.rontidis/RustroverProjects/vector/pront/configs/aws/ec2_meta.yaml"]
--------------------------------------------------------------------------------------------
                                                                                   Validated

Example Data

No response

Additional Context

No response

References

PR #25161