Add chart for adoption rate and rollout percentage in release health

app/components/release_monitoring_component.html.erb

@@ -18,6 +18,9 @@
                                          values: { "total" => errors_count, "new" => new_errors_count },
                                          provider: monitoring_provider,
                                          external_url: monitoring_provider_url) %>
+      <% if adoption_chart_data.present? && helpers.current_user.release_monitoring? %>
+        <div class="col-span-2"><%= render ChartComponent.new(adoption_chart_data, icon: "sparkles.svg") %></div>
+      <% end %>
     </div>
   </article>
 <% end %>

app/components/release_monitoring_component.rb

@@ -48,4 +48,23 @@ def session_stability
     return "-" if release_data.session_stability.blank?
     "#{release_data.session_stability}%"
   end
+
+  def adoption_chart_data
+    @chart_data ||= deployment_run
+      .release_health_metrics
+      .group_by_day(:fetched_at, last: 10)
+      .maximum("round(CAST(sessions_in_last_day::float * 100 / total_sessions_in_last_day::float as numeric), 2)")
+      .compact
+      .map { |k, v| [k.strftime("%d %b"), {adoption_rate: v, rollout_percentage: deployment_run.rollout_percentage_at(k)}] }
+      .to_h
+
+    return unless @chart_data.keys.size >= 2
+
+    {
+      data: @chart_data,
+      type: "line",
+      value_format: "number",
+      name: "release_health.adoption_rate"
+    }
+  end
 end

app/models/deployment_run.rb

@@ -19,6 +19,7 @@ class DeploymentRun < ApplicationRecord
   include Loggable
   include Displayable
   using RefinedArray
+  using RefinedString
 
   belongs_to :step_run, inverse_of: :deployment_runs
   belongs_to :deployment, inverse_of: :deployment_runs
@@ -188,6 +189,18 @@ def staged_rollout_events
     end
   end
 
+  def rollout_percentage_at(ts)
+    return 100.0 unless staged_rollout
+    last_event = staged_rollout
+      .passports
+      .where(reason: [:started, :increased, :fully_released])
+      .where("event_timestamp < ?", ts)
+      .order(:event_timestamp)
+      .last
+    return 100.0 if last_event.reason == "fully_released"
+    last_event.metadata["rollout_percentage"].safe_float
+  end
+
   def submitted_at
     return unless released?
     return unless production_channel?

config/locales/en.yml

@@ -249,6 +249,11 @@ en:
       not_authorized_policy: "Not Authorized %{model} on %{query} action"
       not_logged_in: "You must be logged in to access this page"
   charts:
+    release_health:
+      adoption_rate:
+        title: "Adoption Rate"
+        scope: "With rollout percentage"
+        help_text: ""
     devops:
       duration:
         title: "Release duration"
@@ -279,4 +284,3 @@ en:
         title: "Stability contributors"
         scope: "Last 5 releases"
         help_text: ""
-