feat(ruby/rails-api): add OtelFilterSpanProcessor, Sidekiq OTel fixes, and OTel Collector config#130
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…, and OTel Collector config - Add OtelFilterSpanProcessor inline in opentelemetry.rb — drops BEGIN/COMMIT/ROLLBACK spans, health check paths, OTLP exporter Net::HTTP calls (meta-tracing loop fix), noisy Redis commands, and configurable Sidekiq queue/job spans - Add probabilistic sampling via OTEL_SAMPLE_RATE (parentbased_traceidratio) - Disable ActionView instrumentation (high volume, irrelevant for JSON APIs) - Add config/initializers/sidekiq.rb with OTel shutdown hook to flush spans on stop - Add otel-collector/config.yaml with filter/drop_noise processor (OTTL-based) that mirrors the in-app filter — app → collector → Last9 architecture - Add docker-compose.yaml wiring Rails app to collector (LAST9_* env vars on collector) - Update .env.example with all new OTEL_FILTER_* and collector env vars - Update README with noise reduction guide, OTel Collector mode, and quick start - Fix .gitignore to allow .env.example to be committed Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
OtelFilterSpanProcessortoopentelemetry.rb— dropsBEGIN/COMMIT/ROLLBACKspans, health check paths, OTLP exporter Net::HTTP calls (meta-tracing loop fix), noisy Redis commands, and configurable Sidekiq queue/job spansOTEL_SAMPLE_RATEenv var (parentbased_traceidratio)ActionViewinstrumentation (high volume, irrelevant for JSON APIs)config/initializers/sidekiq.rbwith OTel shutdown hook to flush spans on Sidekiq stopotel-collector/config.yamlwithfilter/drop_noiseprocessor (OTTL-based) mirroring the in-app filter, plus optionalprobabilistic_sampler— enablesapp → collector → Last9architecturedocker-compose.yamlwiring Rails app to OTel Collector (LAST9_*env vars on collector).env.examplewith all newOTEL_FILTER_*and collector env varsCloses FDE-62
Test plan
bundle install && bin/rails serverstarts without errorsBEGIN/COMMIT/ROLLBACKspans absent from traces/healthrequests produce no spansdocker compose upstarts both app and collector; traces flow through collector to Last9OTEL_SAMPLE_RATE=0.1reduces trace volume to ~10%OTEL_FILTER_SIDEKIQ_QUEUES=mailersdrops spans from that queue🤖 Generated with Claude Code