[ereport] index ereport ingestion by SP type/slot #7903
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Currently, the initial ereport ingestion API I added in #7833 proposed a single dropshot API that would be implemented by both sled-agent and MGS. This was possible because the initial design would have indexed all ereport producers (reporters) by a UUID. However, per recent conversations with @cbiffle and @jgallagher, we've determined that Nexus will instead request ereports from service processors indexed by SP physical topology (e.g. type and slot), like the rest of the MGS HTTP API. Therefore, we can no longer have a single HTTP API for ereporters that's implemented by both MGS and sled-agents, and instead, SP ereport ingestion should be a new endpoint on the MGS API. This commit does that, moving the ereport query params into `ereport-types`, eliminating the separate `ereport-api` and `ereport-client` crates, and adding an ereport-ingestion-by-SP-location endpoint to the management gateway API.
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I'm not 100% sure what our disposition on merging this ought to be, as it does add an API to the MGS |
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I'm turning this into a draft as I'm going to keep using this branch to hack up the ereport protocol types a bit more. |
this should make it easier for MGS to blindly turn CBOR into JSON. we can enforce more structure when deserialing.
hawkw
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Apr 4, 2025
It turns out that our Git dependency on the oxidecomputer/management-gateway-service repo hasn't been updated in... a while. We're currently on a commit from September of last year, oxidecomputer/management-gateway-service@9bbac47. This branch updates it to the current HEAD commit, oxidecomputer/management-gateway-service@f9566e6. The only changes in MGS that required code changes in Omicron are: - oxidecomputer/management-gateway-service#291, where I added a new `MeasurementKind` for AMD CPU T<sub>ctl</sub> values (which are not temperatures in degrees Celcius, but a secret third thing). - oxidecomputer/management-gateway-service#316 by @mkeeter, adding the interface to read SP task dumps over the network. Since this adds methods to the `sp_impl::SpHandler` trait, the SP simulator implementations need to be updated, or else they will no longer compile. For now, I've just made these `unimplemented!()`, as we're not currently actually _using_ them. In my PR #7903 implementing ereport ingestion from SPs, I had to make these changes as part of changing the MGS dependency to pull in the new `gateway-sp-comms` code for ereports. Since this isn't actually related, and is just necessary to update the Git dep, I figured I'd pull that commit (49973ae) into its own PR.
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Currently, the initial ereport ingestion API I added in #7833 proposed
a single dropshot API that would be implemented by both sled-agent and
MGS. This was possible because the initial design would have indexed all
ereport producers (reporters) by a UUID. However, per recent
conversations with @cbiffle and @jgallagher, we've determined that Nexus
will instead request ereports from service processors indexed by SP
physical topology (e.g. type and slot), like the rest of the MGS HTTP
API. Therefore, we can no longer have a single HTTP API for ereporters
that's implemented by both MGS and sled-agents, and instead, SP ereport
ingestion should be a new endpoint on the MGS API.
This commit does that, moving the ereport query params into
ereport-types, eliminating the separateereport-apiandereport-clientcrates, and adding an ereport-ingestion-by-SP-locationendpoint to the management gateway API.
Furthermore, there are some terminology changes. The ereport
protocol has a value which we've variously referred to as an "instance
ID", a "generation ID", and a "restart nonce", all of which have
unfortunate name collisions that are potentially confusing or just
unpleasant. We've agreed to refer to this value everywhere as a
"restart ID", so this commit also changes that.