[receiver/filelog] Failing to parse sort timestamp

[Mrod1598]

Component(s)

No response

What happened?

Description

When trying to assign a sort type as timestamp the layout is unable to be parsed.

Steps to Reproduce

Run with a config that uses a timestamp sort type.

Example Config:

    ordering_criteria:
      regex: err\.(?P<time>\d{10})\.log
      sort_by:
        - layout: "%Y%m%d%H"
          regex_key: time
          sort_type: timestamp
          location: UTC

Expected Result

Collector starts and checks the available files.

Actual Result

Running with this fails to start because of the validation being broken through trying to parse a timestamp value that is empty.

Collector version

v0.81.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

receivers:
  filelog/source0:
    encoding: utf-8
    include:
      - ./local/logs/timestampLogsOnly/err.*.log
    ordering_criteria:
      regex: err\.(?P<time>\d{10})\.log
      sort_by:
        - layout: "%Y%m%d%H"
          regex_key: time
          sort_type: timestamp
          location: UTC
        # - sort_type: alphabetical
        #   regex_key: value
    include_file_name: true
    include_file_name_resolved: false
    include_file_path: false
    include_file_path_resolved: false
    max_concurrent_files: 1024
    poll_interval: 200ms
    start_at: beginning

exporters:
  logging/logging: null

service:
  pipelines:
    logs/source0__logging-0:
      receivers:
        - filelog/source0

      exporters:
        - logging/logging

Log output

2023-07-07T14:18:44.497-0400    info    service/telemetry.go:81 Setting up own telemetry...
2023-07-07T14:18:44.498-0400    info    service/telemetry.go:104        Serving Prometheus metrics      {"address": ":8888", "level": "Basic"}
2023-07-07T14:18:44.498-0400    info    [email protected]/exporter.go:275        Development component. May change in the future.        {"kind": "exporter", "data_type": "logs", "name": "logging/logging"}
Error: failed to build pipelines: failed to create "filelog/source0" receiver for data type "logs": parse format %Y%m%d%H: parsing time "" as "2006010215": cannot parse "" as "2006"
2023/07/07 14:18:44 collector server run finished with error: failed to build pipelines: failed to create "filelog/source0" receiver for data type "logs": parse format %Y%m%d%H: parsing time "" as "2006010215": cannot parse "" as "2006"

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/filelog: @djaglowski

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