Loki "deduplicates" multiple logs sent using otlp with the same body and timestamp

[alexgenon]

Describe the bug
We have Java applications where multiple threads are emitting exactly the same log body at exactly the same time (time granularity is ms). The OpenTelemetry resource attribute thread.name is set and used to distinguish between the 2 logs. However, it looks like, since they have the same timestamp and log body, Loki only takes 1 of the 2 logs entries and drop the other one (kind of a de-duplication which is not taking into account the structured metadata).

To Reproduce
Steps to reproduce the behavior:

1. Started Loki (3.2.0)
2. Push 1 log using the otlp endpoint. I have attached the logs I used for testing.
3. Push another log using the otlp endpoint with the same body, attributes and timestamp, just change the thread.name resource attribute.
4. Query: {service_name="duplicates.tests"} term. I tried this query with both Grafana and logcli
5. Only 1 of the 2 logs is returned

Expected behavior
2 logs lines returned with different values for thread_name structured metadata.

Environment:

• Infrastructure: Kubernetes
• Deployment tool: helm

Screenshots, Promtail config, or terminal output
log.json