ParseJSON failing should not drop logs from being exported #43607
Description
Component(s)
processor/transform
Is your feature request related to a problem? Please describe.
Settings
image:
repository: otel/opentelemetry-collector-contrib
tag: 0.137.0
repoURL: 'https://open-telemetry.github.io/opentelemetry-helm-charts'
targetRevision: 0.136
chart: opentelemetry-collector
Kubernetes v1.32
transform:
error_mode: ignore
log_statements:
- error_mode: ignore
context: log
statements:
- merge_maps(log.cache, ParseJSON(log.body), "insert") where IsMatch(log.body, "^\\{")
- set(log.attributes, log.cache)
Issue
Currently logs that are JSON but with non-structured elements within tensed values are being dropped ue to ParseJSON. Although below is valid json, since log.body.value is not, ParseJson/transform errors and drop logs although error_mode: ignore. This log is therefore not exported.
{
"level": "INFO",
"value": "{\"message_id\":\"ce5fa37f-7880-4254-9bdc-7412b89848ad\"}",
"timestamp": "2025-10-16T16:29:01.794Z"
}
ParseJSON however fails on the below but the log still gets exported.
{
"level": "INFO",
"timestamp": "2025-10-16T16:29:01.794Z"
} | NR-LINKING....
Describe the solution you'd like
Expected Scenario:
ParseJSON fails but logs are still exported.
Body.value = {"level":"INFO","value":"{\"message_id\":\"ce5fa37f-7880-4254-9bdc-7412b89848ad\"}","timestamp":"2025-10-16T16:29:01.794Z"}
Best case scenario:
log.body.value should be treated as string.
Attributes.level = INFO
Attributes.value ="{\"message_id\":\"ce5fa37f-7880-4254-9bdc-7412b89848ad\"}"
Attributes.timestamp = "2025-10-16T16:29:01.794Z"
Describe alternatives you've considered
No response
Additional context
No response
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