Loosen IP address scrubbing in span.domain tag

[gggritso]

Problem Statement

IP addresses like 8.8.8.8 get fully scrubbed out to *.*.*.*. When users look at the requests module, all requests to IP addresses get mashed together.

Solution Brainstorm

• no scrubbing at all (IPv4 addresses have a known cardinality. It's only 4 billion! That's fine, right? I'm kidding)
• partial scrubbing (e.g., 8.8.8.8 becomes *.*.8.8 or *.*.*.8 or 8.8.*.*)
• customizable IP scrubbing allowlist (let people add IPs that don't get scrubbed)
• allow self-hosted users to turn IP scrubbing off (people who have their own infra might want to turn this off, and bear the weight of high cardinality)

Product Area

Ingestion and Filtering

[jjbayer]

customizable IP scrubbing allowlist (let people add IPs that don't get scrubbed)

I wonder if we could get to an "80%" solution by hardcoding a list of"special" IPs. E.g. reserved IPs, DNS servers, .... Unless this does not cover the majority of the cases.

[aldy505]

I'd like to see private IPs being not redacted on SaaS and self-hosted. For public IPs, I think it's better if it's redacted on SaaS and not redacted on self-hosted. Since on self-hosted, it's a different environment, it's only possible that the outgoing request is made only for those defined on the tracePropagationTargets config (from the sdk side).