Go Agent version 2.x | APM Go Agent Reference [2.x]

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Go Agent version 2.xedit

Replace authorization with *auth* pattern for sanitizing field names #(1230)
Fetch initial server version async to prevent blocking NewTracer for 10 seconds #(1239)
Fix race in apm.DefaultTracer which could lead to multiple tracers being created #(1248)

Record transaction.name on errors #(1177)
Fix panic in apmgocql #(1180)
Stop recording unused transaction.duration.* and transaction.breakdown.count metrics #(1167)
Make tracestate parsing more lenient, according to W3c spec, allowing duplicate vendor keys #(1183)
Introduced transport.NewHTTPTransportOptions #(1168)
Change ELASTIC_APM_SPAN_FRAMES_MIN_DURATION special cases to match agent spec #(1188)
Remove stacktrace.ContextSetter #(1187)
Drop support for versions of Go prior to 1.15.0 #(1190)
Replace apm.DefaultTracer with an initialization function #(1189)
Remove transport.Default, construct a new Transport in each new tracer #(1195)
Add service name and version to User-Agent header #(1196)
Remove WarningLogger, add Warningf methe to Logger #(1205)
Replace Sampler with ExtendedSampler #(1206)
Drop unsampled txs when connected to an APM Server >= 8.0 #(1208)
Removed SetTag (#1218)
Unexport Tracer’s fields — TracerOptions must be used instead #(1219)