Emiliano Frascaro
a44d9fbadd
Evita di saturare Puma in diretta, separa i check Rails/pubblico e traccia la latenza /up per alert più affidabili. Co-authored-by: Cursor <cursoragent@cursor.com>
45 lines
995 B
Ruby
45 lines
995 B
Ruby
# frozen_string_literal: true
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module Ops
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# Campioni latenza GET /up (edge → rails) per calcolo p95.
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class UpLatencyTracker
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REDIS_KEY = "ops:up_latency_ms"
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MAX_SAMPLES = -> { ENV.fetch("OPS_UP_LATENCY_SAMPLES", "60").to_i }
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class << self
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def record(latency_ms)
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return unless redis
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redis.pipelined do |pipe|
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pipe.lpush(REDIS_KEY, latency_ms.to_i)
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pipe.ltrim(REDIS_KEY, 0, MAX_SAMPLES.call - 1)
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end
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end
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def samples
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return [] unless redis
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redis.lrange(REDIS_KEY, 0, -1).map(&:to_i)
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end
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def sample_count
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samples.size
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end
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def p95
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sorted = samples.sort
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return nil if sorted.empty?
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index = [(sorted.size * 0.95).ceil - 1, 0].max
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sorted[index]
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end
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def redis
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@redis ||= Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/0"))
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rescue Redis::CannotConnectError
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nil
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end
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end
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end
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end
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