[processor/filter] Filters out all logs if logBodies used and logs aren't strings

[sumo-drosiek]

Component(s)

processor/filter

What happened?

Description

All logs are filtered out by filter processor if LogBodies is being used and logs are not a string

Steps to Reproduce

Run configuration with example log

Expected Result

Logs are not filtered out

Actual Result

Logs are filtered out

Collector version

latest

Environment information

Environment

N/A

OpenTelemetry Collector configuration

receivers:
  filelog:
    include:
      - ./tmp/2.log
    start_at: beginning
processors:
  filter/exclude-phi:
    logs:
      exclude:
        bodies:
        - not matches anything
  transform/containers_parse_json:
    error_mode: ignore
    log_statements:
    - context: log
      statements:
      - set(body, ParseJSON(body)) where IsMatch(body, "^{") == true
exporters:
  logging:
    verbosity: detailed
service:
  pipelines:
    logs:
      receivers:
        - filelog
      processors:
        - transform/containers_parse_json
        - filter/exclude-phi
      exporters:
        - logging

Log output

No response

Additional context

./tmp/2.log:

{"level":"info"}

[github-actions]

Pinging code owners:

• processor/filter: @TylerHelmuth @boostchicken

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[sumo-drosiek]

The following configuration may be use as alternative:

  filter:
    logs:
      log_record:
      - 'IsMatch(body, "not matches anything")'

[TylerHelmuth]

I believe #22102 solves this issue.

Another option is to swap the order of the filterprocessor and transformprocessor and do the filtering on the string before the transformprocessor turns the body into a map.