Class: RailsPulse::Queries::Cards::PercentileQueryTimes

Inherits:
Object
  • Object
show all
Defined in:
app/models/rails_pulse/queries/cards/percentile_query_times.rb

Instance Method Summary collapse

Constructor Details

#initialize(query: nil, disabled_tags: [], show_non_tagged: true) ⇒ PercentileQueryTimes

Returns a new instance of PercentileQueryTimes.



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# File 'app/models/rails_pulse/queries/cards/percentile_query_times.rb', line 5

def initialize(query: nil, disabled_tags: [], show_non_tagged: true)
  @query = query
  @disabled_tags = disabled_tags
  @show_non_tagged = show_non_tagged
end

Instance Method Details

#to_metric_card ⇒ Object 



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# File 'app/models/rails_pulse/queries/cards/percentile_query_times.rb', line 11

def to_metric_card
  last_7_days = 7.days.ago.beginning_of_day
  previous_7_days = 14.days.ago.beginning_of_day

  # Single query to get all P95 metrics with conditional aggregation
  base_query = RailsPulse::Summary
    .with_tag_filters(@disabled_tags, @show_non_tagged)
    .where(
      summarizable_type: "RailsPulse::Query",
      period_type: "day",
      period_start: 2.weeks.ago.beginning_of_day..Time.current
    )
  base_query = base_query.where(summarizable_id: @query.id) if @query

  metrics = base_query.select(
    "AVG(p95_duration) AS overall_p95",
    "AVG(CASE WHEN period_start >= '#{last_7_days.strftime('%Y-%m-%d %H:%M:%S')}' THEN p95_duration ELSE NULL END) AS current_p95",
    "AVG(CASE WHEN period_start >= '#{previous_7_days.strftime('%Y-%m-%d %H:%M:%S')}' AND period_start < '#{last_7_days.strftime('%Y-%m-%d %H:%M:%S')}' THEN p95_duration ELSE NULL END) AS previous_p95"
  ).take

  # Calculate metrics from single query result
  p95_query_time = (metrics.overall_p95 || 0).round(0)
  current_period_p95 = metrics.current_p95 || 0
  previous_period_p95 = metrics.previous_p95 || 0

  percentage = previous_period_p95.zero? ? 0 : ((previous_period_p95 - current_period_p95) / previous_period_p95 * 100).abs.round(1)
  trend_icon = percentage < 0.1 ? "move-right" : current_period_p95 < previous_period_p95 ? "trending-down" : "trending-up"
  trend_amount = previous_period_p95.zero? ? "0%" : "#{percentage}%"

  # Sparkline data by day with zero-filled days over the last 14 days
  grouped_daily = base_query
    .group_by_day(:period_start, time_zone: "UTC")
    .average(:p95_duration)

  start_day = 2.weeks.ago.beginning_of_day.to_date
  end_day = Time.current.to_date

  sparkline_data = {}
  (start_day..end_day).each do |day|
    avg = grouped_daily[day]&.round(0) || 0
    label = day.strftime("%b %-d")
    sparkline_data[label] = { value: avg }
  end

  {
    id: "percentile_query_times",
    context: "queries",
    title: "95th Percentile Query Time",
    summary: "#{p95_query_time} ms",
    chart_data: sparkline_data,
    trend_icon: trend_icon,
    trend_amount: trend_amount,
    trend_text: "Compared to last week"
  }
end