Timeseries schema mismatch for `virtual_machine:incomplete_check`

While investigating #6923, I looked at the oximeter logs, and see that there's a schema mismatch for the virtual_machine:incomplete_check timeseries:

    actual = TimeseriesSchema { timeseries_name: TimeseriesName("virtual_machine:incomplete_check"), description: TimeseriesDescription { target: "", metric: "" }, field_schema: {FieldSchema { name: "failure_reason", field_type: String, source: Metric, description: "" }, FieldSchema { name: "instance_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "nexus_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "project_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "rack_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "silo_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "sled_agent_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "sled_agent_ip", field_type: IpAddr, source: Target, description: "" }, FieldSchema { name: "sled_agent_port", field_type: U16, source: Target, description: "" }, FieldSchema { name: "vmm_id", field_type: Uuid, source: Target, description: "" }}, datum_type: CumulativeU64, version: 1, authz_scope: Fleet, units: Count, created: 2024-10-23T21:45:38.254218130Z }
    collector_id = da510a57-3af1-4d2b-b2ed-2e8849f27d8b
    collector_ip = fd00:1122:3344:10a::3
    expected = TimeseriesSchema { timeseries_name: TimeseriesName("virtual_machine:incomplete_check"), description: TimeseriesDescription { target: "", metric: "" }, field_schema: {FieldSchema { name: "instance_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "nexus_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "project_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "rack_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "reason", field_type: String, source: Metric, description: "" }, FieldSchema { name: "silo_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "sled_agent_id", field_type: Uuid, source: Target, description: "" }, FieldSchema { name: "sled_agent_ip", field_type: IpAddr, source: Target, description: "" }, FieldSchema { name: "sled_agent_port", field_type: U16, source: Target, description: "" }, FieldSchema { name: "vmm_id", field_type: Uuid, source: Target, description: "" }}, datum_type: CumulativeU64, version: 1, authz_scope: Fleet, units: Count, created: 2024-06-20T17:45:08.409040686Z }
    file = oximeter/db/src/client/mod.rs:956
    id = 9a4a2991-4e16-4b2b-82e8-266bb31c2e20
    sample = Sample { measurement: Measurement { timestamp: 2024-10-23T21:45:38.190023779Z, datum: CumulativeU64(Cumulative { start_time: 2024-10-23T20:00:48.375346243Z, value: 1 }) }, timeseries_name: TimeseriesName("virtual_machine:incomplete_check"), timeseries_version: 1, target: FieldSet { name: "virtual_machine", fields: {"instance_id": Field { name: "instance_id", value: Uuid(db4aca25-6828-4d7e-8744-83336110e82b) }, "nexus_id": Field { name: "nexus_id", value: Uuid(2898657e-4141-4c05-851b-147bffc6bbbd) }, "project_id": Field { name: "project_id", value: Uuid(829b10e4-19a0-4498-8d4a-ebafa097d307) }, "rack_id": Field { name: "rack_id", value: Uuid(de608e01-b8e4-4d93-b972-a7dbed36dd22) }, "silo_id": Field { name: "silo_id", value: Uuid(7bd7623a-68ed-4636-8ecb-b59e3b068787) }, "sled_agent_id": Field { name: "sled_agent_id", value: Uuid(87c2c4fc-b0c7-4fef-a305-78f0ed265bbc) }, "sled_agent_ip": Field { name: "sled_agent_ip", value: IpAddr(fd00:1122:3344:108::1) }, "sled_agent_port": Field { name: "sled_agent_port", value: U16(12345) }, "vmm_id": Field { name: "vmm_id", value: Uuid(bf8faa13-5c4a-4e21-86a8-e2fa6d198c3a) }} }, metric: FieldSet { name: "incomplete_check", fields: {"failure_reason": Field { name: "failure_reason", value: String("unreachable") }} } }

I don't have any further data, and am going to tackle the higher-priority #6923 first for obvious reasons.

Start at oximeter/db/src/client/mod.rs:956 and inspect how the actual and expected schemas for virtual_machine:incomplete_check are produced and compared. Trace the schema definitions and producer named by the issue, then verify that the timeseries no longer reports a field-name mismatch.