allow stage.replace to extract original values into shared map

[redbaron]

Request

Currently stage.replaces extracts named group values after replacement takes place. Sometimes we'd like to extract original values and then replace them.

Current workaround is to have 2 stages: stage.regex with named capture group to extract into map and stage.replace with almost same regex to replace value.

Use case

extract and then remove timestamp from a logline. timestamp is then used in stage.timestamp and becomes available in loki.

[vaibhavagarwalcool]

cant we do arithmetic operations in alloy or convert timestamps ,
basically i have logs that have following entry

24/06/2025 11:00:19.319 Received 148 Bytes

Sent Message At: 24/06/2025 11:00:19.324

now i want to convert sent time and received time to unix and subtract them to get latency via alloy and than send to loki, is it possible?, is there some way we can do , i just want latency in log itself, i saw you mentioned timestamp so if you have suggestions

[redbaron]

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