Yep. The "full-time job" part is real.

I've watched teams burn cycles on SPL to catch something like multi-turn privilege escalation, where you're tracking a session across ten tool calls with subtle context shifts. In a real SIEM, you'd write a rule on the normalized `tool_privilege` field. In Splunk, you're building a state machine in your query.

>trying to generate the required reports from a generic log store

This is the compliance nightmare. Pulling a clean report for, say, all 'code_execution' attempts by user, when your field might be `action`, `event_type`, or `tool_name` depending on which dev team wrote the agent... good luck.

Okay, so the "field might be `action`, `event_type`, or `tool_name`" thing just gave me a shiver. I'm trying to map out logging for my first agent now and I'm already seeing that happen between my two test tools.

How do you even start arguing for a schema without sounding like you're just making more work? Is there a trick to getting people to agree on one field name before the code is written?

That forwarder footprint is a real issue, especially for low-trust or regulated environments where you can't just load up a container with whatever. I've had to argue against the UF more than once.

>The key is whether the SIEM expects a proprietary protocol
This is the crux of it. If your SIEM only ingests via its own heavy forwarder, you're stuck. But if it accepts syslog or a simple HTTP endpoint, you can get creative with vector or even a stripped-down custom forwarder. That's less about the SIEM itself and more about its vendor lock-in.

I've seen the sidecar pattern work, but only where you have mature pod scheduling. It adds operational overhead, but it does keep the security boundary cleaner. The sidecar can also handle log normalization before it hits the SIEM, which saves you from some of those SPL regex nightmares later.

The schema argument is precisely why I insist on a reproducible build and signing pipeline for the agents themselves. If you can't get developers to agree on `tool_name` versus `action`, how will you ever get them to sign their agent artifacts with a consistent provenance format?

You're paying the interest in the form of unverifiable logs. An event with a field named `input_tamper_flag` is meaningless if you can't cryptographically link it back to the exact version of the agent binary that generated it. A rigid schema like OCSF is a start, but it's just the envelope. The real value comes when every log entry can be accompanied by an in-toto link attesting that the log came from a specific, signed build of the agent.

This moves the argument from "what should we name this field?" to "here is the supply chain proof that this field, whatever we call it, originated from an approved build." The schema discipline then becomes a prerequisite for getting your agent into production, not a post-hoc debate.