otelcol.receiver.filelog defaults don't agree

[petewall]

What's wrong?

Code and docs mismatch.

Steps to reproduce

In the code, otelcol.receiver.filelog's start_at field default to end:
https://github.com/grafana/alloy/blob/main/internal/component/otelcol/receiver/filelog/filelog.go#L119

In the docs, it says it defaults to beginning:
https://github.com/grafana/alloy/blob/main/docs/sources/reference/components/otelcol/otelcol.receiver.filelog.md?plain=1#L44

Looks like the upstream has it default to end, so maybe it's just the doc that needs to be updated.

System information

Ubuntu AMD64

Software version

1.7.1

Configuration

otelcol.receiver.filelog "run_log" {
  include = ["log.txt"]
  start_at = "beginning"
  delete_after_read = true
  attributes = {
    "run_id" = sys.env("RUN_ID"),
  }
  resource = {
    "source" = "github_actions",
    "repository" = sys.env("GITHUB_REPOSITORY"),
    "workflowName" = sys.env("GITHUB_WORKFLOW"),
  }

  output {
    logs = [otelcol.exporter.loki.prep_for_loki.input]
  }
}

Logs

Error: hackathon-action-stat/log-upload.alloy:1:1: Failed to build component: decoding configuration: 1 error occurred:
	* 'delete_after_read' cannot be used with 'start_at = end'
 1 |   otelcol.receiver.filelog "run_log" {
   |  _^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 2 | |   include = ["log.txt"]
 3 | |   delete_after_read = true
 4 | |   attributes = {
 5 | |     "run_id" = sys.env("RUN_ID"),
 6 | |   }
 7 | |   resource = {
 8 | |     "source" = "github_actions",
 9 | |     "repository" = sys.env("GITHUB_REPOSITORY"),
10 | |     "workflowName" = sys.env("GITHUB_WORKFLOW"),
11 | |   }
12 | | 
13 | |   output {
14 | |     logs = [otelcol.exporter.loki.prep_for_loki.input]
15 | |   }
16 | | }
   | |_^
17 |