debugger/symdb: add upload metadata fields to upload event message

[andreimatei]

Add the following fields to the SymDB upload event message that accompanies each multipart upload:

• "version" (top-level): the service version
• "language" (top-level): "java"
• "upload_id" (top-level): a UUID generated once per SymbolSink instance, shared by all batches uploaded by the sink
• "batch_num" (top-level): 1-indexed counter incremented per upload
• "final" (top-level): always false; the Java tracer continuously uploads new code as classes get loaded, so there is no defined end-of-upload point
• "attachment_size" (top-level): size in bytes of the (compressed) attachment payload

Some of these fields are new, to be used by the backend in the future. Others duplicate info that was already included in the attachment; by duplicating some metadata out of the SymDB attachment body into the EvP event body, the backend can populate per-attachment bookkeeping without downloading the attachment.

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Debugger benchmarks

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
ci_job_date	1778262954	1778263300
end_time	2026-05-08T17:57:19	2026-05-08T18:03:06
git_branch	master	andrei/symdb-upload-fields
git_commit_sha	be0f519	37aee89
start_time	2026-05-08T17:55:54	2026-05-08T18:01:41

See matching parameters

	Baseline	Candidate
ci_job_id	1668778267	1668778267
ci_pipeline_id	112230928	112230928
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
git_commit_date	1778262347	1778262347

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 9 metrics, 6 unstable metrics.

See unchanged results

scenario	Δ mean agg_http_req_duration_min	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p75	Δ mean agg_http_req_duration_p99	Δ mean throughput
scenario:noprobe	unstable [-64.720µs; +28.032µs] or [-21.026%; +9.107%]	unstable [-81.993µs; +34.935µs] or [-23.081%; +9.834%]	unstable [-95.799µs; +40.986µs] or [-25.625%; +10.963%]	unstable [-381.093µs; +450.927µs] or [-27.433%; +32.460%]	same
scenario:basic	same	same	same	unstable [+218.947µs; +476.854µs] or [+21.724%; +47.313%]	unstable [-142.849op/s; +142.849op/s] or [-5.714%; +5.714%]
scenario:loop	unsure [-7.832µs; -0.200µs] or [-0.088%; -0.002%]	unsure [-16.496µs; -2.131µs] or [-0.184%; -0.024%]	unsure [-12.725µs; -0.552µs] or [-0.140%; -0.006%]	same	same

Request duration reports for reports

gantt
    title reports - request duration [CI 0.99] : candidate=None, baseline=None
    dateFormat X
    axisFormat %s
section baseline
noprobe (355.238 µs) : 281, 429
.   : milestone, 355,
basic (295.71 µs) : 287, 305
.   : milestone, 296,
loop (8.976 ms) : 8969, 8984
.   : milestone, 8976,
section candidate
noprobe (331.709 µs) : 305, 358
.   : milestone, 332,
basic (293.636 µs) : 287, 300
.   : milestone, 294,
loop (8.967 ms) : 8961, 8973
.   : milestone, 8967,

Loading

• baseline results

Scenario	Request median duration [CI 0.99]
noprobe	355.238 µs [281.156 µs, 429.32 µs]
basic	295.71 µs [286.89 µs, 304.531 µs]
loop	8.976 ms [8.969 ms, 8.984 ms]

• candidate results

Scenario	Request median duration [CI 0.99]
noprobe	331.709 µs [305.451 µs, 357.967 µs]
basic	293.636 µs [287.104 µs, 300.168 µs]
loop	8.967 ms [8.961 ms, 8.973 ms]