Trying to use a credentials file with AWS auth throws an error

[protochron]

A note for the community

I have a PR ready to go to fix this.

Problem

The Vector docs indicate that AWS credential files are supported as an authentication method, however that doesn't seem to be the case. Attempting to use a credentials file in a sink ends up with a log message indicating an error (Overriding the credentials file is not supported.). Reading the code, it looks like the credentials provider implementation does not actually support this method.

Since this method of AWS authentication is intended to be supported, it should actually work.

Configuration

[api]
enabled = true
address = "127.0.0.1:8686"

[sources.internal_metrics]
type = "internal_metrics"
scrape_interval_secs = 15

[sinks.prometheus_remote_write]
type     = "prometheus_remote_write"
inputs   = ["internal_metrics"]

auth.strategy = "aws"
auth.credentials_file = "secrets/aws.creds"
auth.profile = "default"
endpoint = "http://an-endpoint.example/api/v1/remote_write"
aws.region = "us-east-2"

Version

0.28.0

Debug Output

No response

Example Data

No response

Additional Context

No response

References

No response

[protochron]

Updated the issue with a minimal example that shows how to reproduce the error. If you run that example through vector validate it shows the issue pretty clearly:

$ vector validate /tmp/vector.toml
√ Loaded ["/tmp/vector.toml"]

Component errors
----------------
x Sink "prometheus_remote_write": Overriding the credentials file is not supported.```