OpenTelemetry tracing#695
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Add support for OpenTelemetry tracing to the Thanos PromQL engine. If a trace context is inherited in the go context passed to a query execution, trace spans will be emitted for: * The top level query * Storage access * Outbound calls for distributed query Trace spans include key attributes like: * Request queries or selectors * Response series and sample counts If the EnableAnalysis query option is set on the query, operation-level tracing will be performed on the query's execution. Per-operation tracing may also be enabled by setings the trace baggage field "promql.enable_analysis" to "true". Baggage-based control is used so that analysis can be controlled by a higher level in the query execution chain without having to propagate specific query options. Signed-off-by: Craig Ringer <craig.ringer@enterprisedb.com>
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This is an early LLM-assisted draft for adding OpenTelemetry tracing to the Thanos PromQL engine