Ruby Reactor Now Has Middlewares and OpenTelemetry — Here's Why That Matters

**TL;DR:** Ruby Reactor Now Has Middlewares and OpenTelemetry — Here's Why That Matters

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You've built a checkout reactor that reserves inventory, charges a card, generates a shipping label, and sends a confirmation email. It runs through Sidekiq. When something fails, compensation logic rolls it back. It works. Then your team asks: "How many checkouts failed this week? Which step? How long does the charge step take at p99? 0, you'd need to add logging calls to every step, build a custom Sidekiq middleware, and figure out how to correlate traces across async job boundaries. Now it's one line of config.

0 introduces a middleware pipeline — the same pattern that powers Rack, but designed for saga execution. A middleware is a plain Ruby object that hooks into the reactor lifecycle: class TimingMiddleware RubyReactor :: Middleware def initialize ( ** options ) super @started = {} end def on_start_step ( step_name , _arguments , _context ) @started [ step_name ] = Process . clock_gettime ( Process :: CLOCK_MONOTONIC ) end def on_complete_step ( step_name , _result , _context ) started = @started .

delete ( step_name ) return unless started elapsed = Process . clock_gettime ( Process

Source: Dev.to

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Last updated: June 16, 2026.

Additional context: early-cycle stories often look bigger in headlines than in day-to-day impact. The useful move is to identify the smallest set of facts that would change your decision, then wait for those facts to land.

Additional context: early-cycle stories often look bigger in headlines than in day-to-day impact. The useful move is to identify the smallest set of facts that would change your decision, then wait for those facts to land.