Add support for logging Prometheus metrics for Geo

app/assets/javascripts/geo_nodes.js

@@ -58,8 +58,8 @@ class GeoNodeStatus {
       this.setHealthStatus(status.healthy);
 
       // Replication lag can be nil if the secondary isn't actually streaming
-      if (status.db_replication_lag) {
-        const parsedTime = parseSeconds(status.db_replication_lag, {
+      if (status.db_replication_lag_seconds !== null && status.db_replication_lag_seconds >= 0) {
+        const parsedTime = parseSeconds(status.db_replication_lag_seconds, {
           hoursPerDay: 24,
           daysPerWeek: 7,
         });
@@ -96,8 +96,17 @@ class GeoNodeStatus {
       this.$attachmentsSynced.text(attachmentText);
       this.$attachmentsFailed.text(attachmentFailedText);
 
-      const eventDate = gl.utils.formatDate(new Date(status.last_event_date));
-      const cursorDate = gl.utils.formatDate(new Date(status.cursor_last_event_date));
+      let eventDate = 'N/A';
+      let cursorDate = 'N/A';
+
+      if (status.last_event_timestamp !== null) {
+        eventDate = gl.utils.formatDate(new Date(status.last_event_timestamp * 1000));
+      }
+
+      if (status.cursor_last_event_timestamp !== null) {
+        cursorDate = gl.utils.formatDate(new Date(status.cursor_last_event_timestamp * 1000));
+      }
+
       this.$lastEventSeen.text(`${status.last_event_id} (${eventDate})`);
       this.$lastCursorEvent.text(`${status.cursor_last_event_id} (${cursorDate})`);
       if (status.health === 'Healthy') {

app/models/geo_node_status.rb

 class GeoNodeStatus
   include ActiveModel::Model
 
-  attr_accessor :id
+  attr_accessor :id, :success
   attr_writer :health
 
   def health
@@ -14,14 +14,14 @@ class GeoNodeStatus
     health.blank?
   end
 
-  def db_replication_lag
-    return @db_replication_lag if defined?(@db_replication_lag)
+  def db_replication_lag_seconds
+    return @db_replication_lag_seconds if defined?(@db_replication_lag_seconds)
 
-    @db_replication_lag = Gitlab::Geo::HealthCheck.db_replication_lag if Gitlab::Geo.secondary?
+    @db_replication_lag_seconds = Gitlab::Geo::HealthCheck.db_replication_lag_seconds if Gitlab::Geo.secondary?
   end
 
-  def db_replication_lag=(value)
-    @db_replication_lag = value
+  def db_replication_lag_seconds=(value)
+    @db_replication_lag_seconds = value
   end
 
   def last_event_id
@@ -32,12 +32,12 @@ class GeoNodeStatus
     @last_event_id = value
   end
 
-  def last_event_date
-    @last_event_date ||= Geo::EventLog.latest_event&.created_at
+  def last_event_timestamp
+    @last_event_timestamp ||= Geo::EventLog.latest_event&.created_at&.to_i
   end
 
-  def last_event_date=(value)
-    @last_event_date = value
+  def last_event_timestamp=(value)
+    @last_event_timestamp = value
   end
 
   def cursor_last_event_id
@@ -50,16 +50,16 @@ class GeoNodeStatus
     @cursor_last_event_id = value
   end
 
-  def cursor_last_event_date
+  def cursor_last_event_timestamp
     event_id = cursor_last_event_id
 
     return unless event_id
 
-    @cursor_last_event_date ||= Geo::EventLog.find_by(id: event_id)&.created_at
+    @cursor_last_event_timestamp ||= Geo::EventLog.find_by(id: event_id)&.created_at&.to_i
   end
 
-  def cursor_last_event_date=(value)
-    @cursor_last_event_date = value
+  def cursor_last_event_timestamp=(value)
+    @cursor_last_event_timestamp = value
   end
 
   def repositories_count
@@ -159,6 +159,10 @@ class GeoNodeStatus
     sync_percentage(attachments_count, attachments_synced_count)
   end
 
+  def [](key)
+    public_send(key) # rubocop:disable GitlabSecurity/PublicSend
+  end
+
   private
 
   def sync_percentage(total, synced)

app/serializers/geo_node_status_entity.rb

@@ -15,7 +15,7 @@ class GeoNodeStatusEntity < Grape::Entity
     number_to_percentage(node.attachments_synced_in_percentage, precision: 2)
   end
 
-  expose :db_replication_lag
+  expose :db_replication_lag_seconds
 
   expose :lfs_objects_count
   expose :lfs_objects_synced_count
@@ -32,7 +32,7 @@ class GeoNodeStatusEntity < Grape::Entity
   end
 
   expose :last_event_id
-  expose :last_event_date
+  expose :last_event_timestamp
   expose :cursor_last_event_id
-  expose :cursor_last_event_date
+  expose :cursor_last_event_timestamp
 end

app/services/geo/metrics_update_service.rb

+module Geo
+  class MetricsUpdateService
+    METRIC_PREFIX = 'geo_'.freeze
+
+    def execute
+      return unless Gitlab::Geo.enabled?
+
+      if Gitlab::Geo.primary?
+        fetch_secondary_geo_nodes_metrics
+      else
+        fetch_current_geo_node_metrics
+      end
+    end
+
+    private
+
+    def fetch_secondary_geo_nodes_metrics
+      Gitlab::Geo.secondary_nodes.find_each { |node| fetch_geo_node_metrics(node) }
+    end
+
+    def fetch_current_geo_node_metrics
+      fetch_geo_node_metrics(Gitlab::Geo.current_node)
+    end
+
+    def fetch_geo_node_metrics(node)
+      status = node_status(node)
+
+      unless status.success
+        increment_failed_status_counter(node)
+        return
+      end
+
+      NodeStatusService::STATUS_DATA.each do |key, docstring|
+        value = status[key]
+
+        next unless value.is_a?(Integer)
+
+        gauge = Gitlab::Metrics.gauge(gauge_metric_name(key), docstring, {}, :max)
+        gauge.set(metric_labels(node), value)
+      end
+
+      set_last_updated_at(node)
+    end
+
+    def node_status(node)
+      NodeStatusService.new.call(node)
+    end
+
+    def set_last_updated_at(node)
+      gauge = Gitlab::Metrics.gauge(
+        :geo_status_last_updated_timestamp,
+        'UNIX timestamp of last time Geo node status was updated internally',
+        {},
+        :max)
+
+      gauge.set(metric_labels(node), Time.now.to_i)
+    end
+
+    def increment_failed_status_counter(node)
+      failed_status_counter(node).increment
+    end
+
+    def failed_status_counter(node)
+      Gitlab::Metrics.counter(
+        :geo_status_failed_total,
+        'Total number of times status for Geo node failed to retrieve',
+        metric_labels(node))
+    end
+
+    def gauge_metric_name(name)
+      # Prometheus naming conventions in
+      # https://prometheus.io/docs/instrumenting/writing_exporters/#naming says
+      # that _count and _total should be reserved for counters
+      base_name = name.to_s.gsub(/(_count|_total)$/, '')
+
+      (METRIC_PREFIX + base_name).to_sym
+    end
+
+    def metric_labels(node)
+      { url: node.url }
+    end
+  end
+end

app/services/geo/node_status_service.rb

@@ -3,53 +3,59 @@ module Geo
     include Gitlab::CurrentSettings
     include HTTParty
 
-    KEYS = %w(
-      health
-      db_replication_lag
-      repositories_count
-      repositories_synced_count
-      repositories_failed_count
-      lfs_objects_count
-      lfs_objects_synced_count
-      lfs_objects_failed_count
-      attachments_count
-      attachments_synced_count
-      attachments_failed_count
-      last_event_id
-      last_event_date
-      cursor_last_event_id
-      cursor_last_event_date
-    ).freeze
+    STATUS_DATA = {
+      health: 'Summary of health status',
+      db_replication_lag_seconds: 'Database replication lag (seconds)',
+      repositories_count: 'Total number of repositories available on primary',
+      repositories_synced_count: 'Number of repositories synced on secondary',
+      repositories_failed_count: 'Number of repositories failed to sync on secondary',
+      lfs_objects_count: 'Total number of LFS objects available on primary',
+      lfs_objects_synced_count: 'Number of LFS objects synced on secondary',
+      lfs_objects_failed_count: 'Number of LFS objects failed to sync on secondary',
+      attachments_count: 'Total number of file attachments available on primary',
+      attachments_synced_count: 'Number of attachments synced on secondary',
+      attachments_failed_count: 'Number of attachments failed to sync on secondary',
+      last_event_id: 'Database ID of the latest event log entry on the primary',
+      last_event_timestamp: 'UNIX timestamp of the latest event log entry on the primary',
+      cursor_last_event_id: 'Last database ID of the event log processed by the secondary',
+      cursor_last_event_timestamp: 'Last UNIX timestamp of the event log processed by the secondary'
+    }.freeze
 
     def call(geo_node)
-      values =
-        begin
-          response = self.class.get(geo_node.status_url, headers: headers, timeout: timeout)
+      data = { id: geo_node.id }
 
-          if response.success?
-            response.parsed_response.values_at(*KEYS)
-          else
-            message = "Could not connect to Geo node - HTTP Status Code: #{response.code} #{response.message}"
-            payload = response.parsed_response
-            details =
-              if payload.is_a?(Hash)
-                payload['message']
-              else
-                # The return value can be a giant blob of HTML; ignore it
-                ''
-              end
+      begin
+        response = self.class.get(geo_node.status_url, headers: headers, timeout: timeout)
+        data[:success] = response.success?
 
-            Array([message, details].compact.join("\n"))
-          end
-        rescue Gitlab::Geo::GeoNodeNotFoundError
-          ['This GitLab instance does not appear to be configured properly as a Geo node. Make sure the URLs are using the correct fully-qualified domain names.']
-        rescue OpenSSL::Cipher::CipherError
-          ['Error decrypting the Geo secret from the database. Check that the primary uses the correct db_key_base.']
-        rescue HTTParty::Error, Timeout::Error, SocketError, SystemCallError, OpenSSL::SSL::SSLError => e
-          [e.message]
+        if response.success?
+          data.merge!(response.parsed_response.symbolize_keys.slice(*STATUS_DATA.keys))
+        else
+          message = "Could not connect to Geo node - HTTP Status Code: #{response.code} #{response.message}"
+          payload = response.parsed_response
+          details =
+            if payload.is_a?(Hash)
+              payload['message']
+            else
+              # The return value can be a giant blob of HTML; ignore it
+              ''
+            end
+
+          data[:health] = [message, details].compact.join("\n")
         end
+      rescue Gitlab::Geo::GeoNodeNotFoundError
+        data[:health] = 'This GitLab instance does not appear to be configured properly as a Geo node. Make sure the URLs are using the correct fully-qualified domain names.'
+      rescue OpenSSL::Cipher::CipherError
+        data[:health] = 'Error decrypting the Geo secret from the database. Check that the primary uses the correct db_key_base.'
+      rescue HTTParty::Error, Timeout::Error, SocketError, SystemCallError, OpenSSL::SSL::SSLError => e
+        data[:health] = e.message
+      end
+
+      GeoNodeStatus.new(data)
+    end
 
-      GeoNodeStatus.new(KEYS.zip(values).to_h.merge(id: geo_node.id))
+    def status_keys
+      STATUS_DATA.stringify_keys.keys
     end
 
     private

app/workers/concerns/exclusive_lease_guard.rb

+module ExclusiveLeaseGuard
+  extend ActiveSupport::Concern
+
+  def lease_key
+    @lease_key ||= self.class.name.underscore
+  end
+
+  def try_obtain_lease
+    lease = exclusive_lease.try_obtain
+
+    unless lease
+      log_error('Cannot obtain an exclusive lease. There must be another worker already in execution.')
+      return
+    end
+
+    begin
+      yield lease
+    ensure
+      release_lease(lease)
+    end
+  end
+
+  def exclusive_lease
+    @lease ||= Gitlab::ExclusiveLease.new(lease_key, timeout: lease_timeout)
+  end
+
+  def release_lease(uuid)
+    Gitlab::ExclusiveLease.cancel(lease_key, uuid)
+  end
+end

app/workers/geo/metrics_update_worker.rb

+module Geo
+  class MetricsUpdateWorker
+    include Sidekiq::Worker
+    include ExclusiveLeaseGuard
+    include CronjobQueue
+
+    LEASE_TIMEOUT = 5.minutes
+
+    def perform
+      return unless Gitlab::Metrics.prometheus_metrics_enabled?
+
+      try_obtain_lease { Geo::MetricsUpdateService.new.execute }
+    end
+
+    def lease_timeout
+      LEASE_TIMEOUT
+    end
+  end
+end

changelogs/unreleased-ee/sh-geo-add-prom-metrics.yml

+---
+title: Add support for logging Prometheus metrics for Geo
+merge_request: !3187
+author:
+type: added

config/gitlab.yml.example

@@ -241,13 +241,18 @@ production: &base
     ldap_sync_worker:
       cron: "30 1 * * *"
 
-    # GitLab Geo repository sync worker
+    # GitLab Geo metrics update worker
     # NOTE: This will only take effect if Geo is enabled
+    geo_metrics_update_worker:
+      cron: "*/1 * * * *"
+
+    # GitLab Geo repository sync worker
+    # NOTE: This will only take effect if Geo is enabled (secondary nodes only)
     geo_repository_sync_worker:
       cron: "*/5 * * * *"
 
     # GitLab Geo file download dispatch worker
-    # NOTE: This will only take effect if Geo is enabled
+    # NOTE: This will only take effect if Geo is enabled (secondary nodes only)
     geo_file_download_dispatch_worker:
       cron: "*/10 * * * *"
 

config/initializers/1_settings.rb

@@ -443,6 +443,9 @@ Settings.cron_jobs['ldap_sync_worker']['job_class'] = 'LdapSyncWorker'
 Settings.cron_jobs['ldap_group_sync_worker'] ||= Settingslogic.new({})
 Settings.cron_jobs['ldap_group_sync_worker']['cron'] ||= '0 * * * *'
 Settings.cron_jobs['ldap_group_sync_worker']['job_class'] = 'LdapAllGroupsSyncWorker'
+Settings.cron_jobs['geo_metrics_update_worker'] ||= Settingslogic.new({})
+Settings.cron_jobs['geo_metrics_update_worker']['cron'] ||= '*/1 * * * *'
+Settings.cron_jobs['geo_metrics_update_worker']['job_class'] ||= 'Geo::MetricsUpdateWorker'
 Settings.cron_jobs['geo_repository_sync_worker'] ||= Settingslogic.new({})
 Settings.cron_jobs['geo_repository_sync_worker']['cron'] ||= '*/1 * * * *'
 Settings.cron_jobs['geo_repository_sync_worker']['job_class'] ||= 'Geo::RepositorySyncWorker'

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -22,7 +22,7 @@ collect metrics from this endpoint. We recommend setting up another Prometheus
 server, because the embedded server configuration is overwritten once every
 [reconfigure of GitLab][reconfigure]. In the future this will not be required.
 
-## Metrics available
+## Unicorn Metrics available
 
 In this experimental phase, only a few metrics are available:
 
@@ -48,6 +48,30 @@ In this experimental phase, only a few metrics are available:
 | filesystem_circuitbreaker_latency_seconds | Histogram | 9.5 | Latency of the stat check the circuitbreaker uses to probe a shard |
 | filesystem_circuitbreaker         | Gauge     | 9.5   | Wether or not the circuit for a certain shard is broken or not |
 
+## Sidekiq Metrics available
+
+Sidekiq jobs may also gather metrics, and these metrics can be accessed if the Sidekiq exporter is enabled (e.g. via
+the `monitoring.sidekiq_exporter` configuration option in `gitlab.yml`.
+
+| Metric                            | Type      | Since | Description | Labels |
+|:--------------------------------- |:--------- |:----- |:----------- |:------ |
+|geo_db_replication_lag_seconds     | Gauge     | 10.2  | Database replication lag (seconds) | url
+|geo_repositories                   | Gauge     | 10.2  | Total number of repositories available on primary | url
+|geo_repositories_synced            | Gauge     | 10.2  | Number of repositories synced on secondary | url
+|geo_repositories_failed            | Gauge     | 10.2  | Number of repositories failed to sync on secondary | url
+|geo_lfs_objects                    | Gauge     | 10.2  | Total number of LFS objects available on primary | url
+|geo_lfs_objects_synced             | Gauge     | 10.2  | Number of LFS objects synced on secondary | url
+|geo_lfs_objects_failed             | Gauge     | 10.2  | Number of LFS objects failed to sync on secondary | url
+|geo_attachments                    | Gauge     | 10.2  | Total number of file attachments available on primary | url
+|geo_attachments_synced             | Gauge     | 10.2  | Number of attachments synced on secondary | url
+|geo_attachments_failed             | Gauge     | 10.2  | Number of attachments failed to sync on secondary | url
+|geo_last_event_id                  | Gauge     | 10.2  | Database ID of the latest event log entry on the primary | url
+|geo_last_event_timestamp           | Gauge     | 10.2  | UNIX timestamp of the latest event log entry on the primary | url
+|geo_cursor_last_event_id           | Gauge     | 10.2  | Last database ID of the event log processed by the secondary | url
+|geo_cursor_last_event_timestamp    | Gauge     | 10.2  | Last UNIX timestamp of the event log processed by the secondary | url
+|geo_status_last_updated_timestamp  | Gauge     | 10.2  | Last timestamp when the status was successfully updated | url
+|geo_status_failed_total            | Counter   | 10.2  | Number of times retrieving the status from the Geo Node failed | url
+
 ## Metrics shared directory
 
 GitLab's Prometheus client requires a directory to store metrics data shared between multi-process services.

lib/api/entities.rb

@@ -1010,7 +1010,7 @@ module API
 
     class GeoNodeStatus < Grape::Entity
       expose :id
-      expose :db_replication_lag
+      expose :db_replication_lag_seconds
       expose :health
       expose :healthy?, as: :healthy
       expose :repositories_count
@@ -1023,9 +1023,9 @@ module API
       expose :attachments_synced_count
       expose :attachments_failed_count
       expose :last_event_id
-      expose :last_event_date
+      expose :last_event_timestamp
       expose :cursor_last_event_id
-      expose :cursor_last_event_date
+      expose :cursor_last_event_timestamp
     end
 
     class PersonalAccessToken < Grape::Entity

lib/gitlab/geo.rb

@@ -12,6 +12,7 @@ module Gitlab
       geo_oauth_application
     ).freeze
 
+    COMMON_JOBS = %i(metrics_update_job).freeze
     SECONDARY_JOBS = %i(repository_sync_job file_download_job).freeze
 
     FDW_SCHEMA = 'gitlab_secondary'.freeze
@@ -95,6 +96,10 @@ module Gitlab
       Sidekiq::Cron::Job.find('geo_file_download_dispatch_worker')
     end
 
+    def self.metrics_update_job
+      Sidekiq::Cron::Job.find('geo_metrics_update_worker')
+    end
+
     def self.configure_primary_jobs!
       self.enable_all_cron_jobs!
       SECONDARY_JOBS.each { |job| self.__send__(job).try(:disable!) } # rubocop:disable GitlabSecurity/PublicSend
@@ -102,11 +107,11 @@ module Gitlab
 
     def self.configure_secondary_jobs!
       self.disable_all_cron_jobs!
-      SECONDARY_JOBS.each { |job| self.__send__(job).try(:enable!) } # rubocop:disable GitlabSecurity/PublicSend
+      (COMMON_JOBS + SECONDARY_JOBS).each { |job| self.__send__(job).try(:enable!) } # rubocop:disable GitlabSecurity/PublicSend
     end
 
     def self.disable_all_geo_jobs!
-      SECONDARY_JOBS.each { |job| self.__send__(job).try(:disable!) } # rubocop:disable GitlabSecurity/PublicSend
+      (COMMON_JOBS + SECONDARY_JOBS).each { |job| self.__send__(job).try(:disable!) } # rubocop:disable GitlabSecurity/PublicSend
     end
 
     def self.disable_all_cron_jobs!

lib/gitlab/geo/health_check.rb

@@ -7,7 +7,7 @@ module Gitlab
         return '' unless Gitlab::Geo.secondary?
         return 'The Geo database configuration file is missing.' unless Gitlab::Geo.geo_database_configured?
         return 'The Geo node has a database that is not configured for streaming replication with the primary node.' unless self.database_secondary?
-        return 'The Geo node does not appear to be replicating data from the primary node.' unless self.db_replication_lag.present?
+        return 'The Geo node does not appear to be replicating data from the primary node.' unless self.db_replication_lag_seconds.present?
 
         database_version  = self.get_database_version.to_i
         migration_version = self.get_migration_version.to_i
@@ -60,9 +60,10 @@ module Gitlab
           .fetch('pg_is_in_recovery') == 't'
       end
 
-      def self.db_replication_lag
+      def self.db_replication_lag_seconds
         # Obtain the replication lag in seconds
-        ActiveRecord::Base.connection.execute('
+        lag =
+          ActiveRecord::Base.connection.execute('
           SELECT CASE
                  WHEN pg_last_xlog_receive_location() = pg_last_xlog_replay_location()
                   THEN 0
@@ -72,6 +73,8 @@ module Gitlab
                  AS replication_lag')
           .first
           .fetch('replication_lag')
+
+        lag.present? ? lag.to_i : lag
       end
     end
   end

spec/controllers/admin/geo_nodes_controller_spec.rb

@@ -273,9 +273,9 @@ describe Admin::GeoNodesController, :postgresql do
           repositories_synced_count: 5,
           repositories_failed_count: 0,
           last_event_id: 2,
-          last_event_date: Time.now.iso8601,
+          last_event_timestamp: Time.now.to_i,
           cursor_last_event_id: 1,
-          cursor_last_event_date: Time.now.iso8601
+          cursor_last_event_timestamp: Time.now.to_i
         )
       end
 

spec/fixtures/api/schemas/geo_node_status.json

@@ -10,14 +10,14 @@
     "lfs_objects_count",
     "lfs_objects_failed_count",
     "lfs_objects_synced_count",
-    "db_replication_lag",
+    "db_replication_lag_seconds",
     "repositories_count",
     "repositories_failed_count",
     "repositories_synced_count",
     "last_event_id",
-    "last_event_date",
+    "last_event_timestamp",
     "cursor_last_event_id",
-    "cursor_last_event_date"
+    "cursor_last_event_timestamp"
   ],
   "properties" : {
     "id": { "type": "integer" },
@@ -27,7 +27,7 @@
     "attachments_failed_count": { "type": "integer" },
     "attachments_synced_count": { "type": "integer" },
     "attachments_synced_in_percentage": { "type": "string" },
-    "db_replication_lag": { "type": ["integer", "null"] },
+    "db_replication_lag_seconds": { "type": ["integer", "null"] },
     "lfs_objects_count": { "type": "integer" },
     "lfs_objects_failed_count": { "type": "integer" },
     "lfs_objects_synced_count": { "type": "integer" },
@@ -37,9 +37,9 @@
     "repositories_synced_count": { "type": "integer" },
     "repositories_synced_in_percentage": { "type": "string" },
     "last_event_id": { "type": ["integer", "null"] },
-    "last_event_date": { "type": ["string", "null"] },
+    "last_event_timestamp": { "type": ["integer", "null"] },
     "cursor_last_event_id": { "type": ["integer", "null"] },
-    "cursor_last_event_date": { "type": ["string", "null"] }
+    "cursor_last_event_timestamp": { "type": ["integer", "null"] }
   },
   "additionalProperties": false
 }

spec/lib/gitlab/geo/health_check_spec.rb

@@ -15,7 +15,7 @@ describe Gitlab::Geo::HealthCheck, :postgresql do
       allow(described_class).to receive(:database_secondary?).and_return(true)
       allow(described_class).to receive(:get_database_version).and_return('20170101')
       allow(described_class).to receive(:get_migration_version).and_return('20170201')
-      allow(described_class).to receive(:db_replication_lag).and_return(0)
+      allow(described_class).to receive(:db_replication_lag_seconds).and_return(0)
 
       message = subject.perform_checks
 
@@ -54,7 +54,7 @@ describe Gitlab::Geo::HealthCheck, :postgresql do
     it 'returns an error when Geo database version does not match the latest migration version' do
       allow(described_class).to receive(:database_secondary?).and_return(true)
       allow(subject).to receive(:get_database_version) { 1 }
-      allow(described_class).to receive(:db_replication_lag).and_return(0)
+      allow(described_class).to receive(:db_replication_lag_seconds).and_return(0)
 
       expect(subject.perform_checks).to match(/Current Geo database version \([0-9]+\) does not match latest migration \([0-9]+\)/)
     end
@@ -62,14 +62,14 @@ describe Gitlab::Geo::HealthCheck, :postgresql do
     it 'returns an error when latest migration version does not match the Geo database version' do
       allow(described_class).to receive(:database_secondary?).and_return(true)
       allow(subject).to receive(:get_migration_version) { 1 }
-      allow(described_class).to receive(:db_replication_lag).and_return(0)
+      allow(described_class).to receive(:db_replication_lag_seconds).and_return(0)
 
       expect(subject.perform_checks).to match(/Current Geo database version \([0-9]+\) does not match latest migration \([0-9]+\)/)
     end
 
     it 'returns an error when replication lag is not present' do
       allow(described_class).to receive(:database_secondary?).and_return(true)
-      allow(described_class).to receive(:db_replication_lag).and_return(nil)
+      allow(described_class).to receive(:db_replication_lag_seconds).and_return(nil)
 
       expect(subject.perform_checks).to match(/The Geo node does not appear to be replicating data from the primary node/)
     end

spec/lib/gitlab/geo_spec.rb

@@ -186,7 +186,7 @@ describe Gitlab::Geo, :geo do
   end
 
   describe '.configure_cron_jobs!' do
-    JOBS = %w(ldap_test geo_repository_sync_worker geo_file_download_dispatch_worker).freeze
+    JOBS = %w(ldap_test geo_repository_sync_worker geo_file_download_dispatch_worker geo_metrics_update_worker).freeze
 
     def init_cron_job(job_name, class_name)
       job = Sidekiq::Cron::Job.new(
@@ -211,6 +211,7 @@ describe Gitlab::Geo, :geo do
 
       expect(described_class.repository_sync_job).not_to be_enabled
       expect(described_class.file_download_job).not_to be_enabled
+      expect(described_class.metrics_update_job).to be_enabled
       expect(Sidekiq::Cron::Job.find('ldap_test')).to be_enabled
     end
 
@@ -222,15 +223,17 @@ describe Gitlab::Geo, :geo do
       expect(Sidekiq::Cron::Job.find('ldap_test')).not_to be_enabled
       expect(described_class.repository_sync_job).to be_enabled
       expect(described_class.file_download_job).to be_enabled
+      expect(described_class.metrics_update_job).to be_enabled
     end
 
     it 'deactivates all jobs when Geo is not active' do
-      GeoNode.update_all(enabled: false)
+      stub_current_geo_node(nil)
 
       described_class.configure_cron_jobs!
 
       expect(described_class.repository_sync_job).not_to be_enabled
       expect(described_class.file_download_job).not_to be_enabled
+      expect(described_class.metrics_update_job).not_to be_enabled
       expect(Sidekiq::Cron::Job.find('ldap_test')).to be_enabled
     end
 

spec/models/geo_node_status_spec.rb

@@ -124,18 +124,18 @@ describe GeoNodeStatus do
     end
   end
 
-  describe '#db_replication_lag' do
+  describe '#db_replication_lag_seconds' do
     it 'returns the set replication lag if secondary' do
       allow(Gitlab::Geo).to receive(:secondary?).and_return(true)
-      allow(Gitlab::Geo::HealthCheck).to receive(:db_replication_lag).and_return(1000)
+      allow(Gitlab::Geo::HealthCheck).to receive(:db_replication_lag_seconds).and_return(1000)
 
-      expect(subject.db_replication_lag).to eq(1000)
+      expect(subject.db_replication_lag_seconds).to eq(1000)
     end
 
     it "doesn't attempt to set replication lag if primary" do
-      expect(Gitlab::Geo::HealthCheck).not_to receive(:db_replication_lag)
+      expect(Gitlab::Geo::HealthCheck).not_to receive(:db_replication_lag_seconds)
 
-      expect(subject.db_replication_lag).to eq(nil)
+      expect(subject.db_replication_lag_seconds).to eq(nil)
     end
   end
 
@@ -217,25 +217,25 @@ describe GeoNodeStatus do
     end
   end
 
-  describe '#last_event_id and #last_event_date' do
+  describe '#last_event_id and #last_event_timestamp' do
     it 'returns nil when no events are available' do
       expect(subject.last_event_id).to be_nil
-      expect(subject.last_event_date).to be_nil
+      expect(subject.last_event_timestamp).to be_nil
     end
 
     it 'returns the latest event' do
-      created_at = Date.new(2017, 10, 22)
+      created_at = Date.today.to_time(:utc)
       event = create(:geo_event_log, created_at: created_at)
 
       expect(subject.last_event_id).to eq(event.id)
-      expect(subject.last_event_date).to eq(created_at)
+      expect(subject.last_event_timestamp).to eq(created_at.to_i)
     end
   end
 
-  describe '#cursor_last_event_id and #cursor_last_event_date' do
+  describe '#cursor_last_event_id and #cursor_last_event_timestamp' do
     it 'returns nil when no events are available' do
       expect(subject.cursor_last_event_id).to be_nil
-      expect(subject.cursor_last_event_date).to be_nil
+      expect(subject.cursor_last_event_timestamp).to be_nil
     end
 
     it 'returns the latest event ID if secondary' do
@@ -248,14 +248,25 @@ describe GeoNodeStatus do
     it "doesn't attempt to retrieve cursor if primary" do
       create(:geo_event_log_state)
 
-      expect(subject.cursor_last_event_date).to eq(nil)
+      expect(subject.cursor_last_event_timestamp).to eq(nil)
       expect(subject.cursor_last_event_id).to eq(nil)
     end
   end
 
+  describe '#[]' do
+    it 'returns values for each attribute' do
+      expect(subject[:repositories_count]).to eq(4)
+      expect(subject[:repositories_synced_count]).to eq(0)
+    end
+
+    it 'raises an error for invalid attributes' do
+      expect { subject[:testme] }.to raise_error(NoMethodError)
+    end
+  end
+
   context 'when no values are available' do
     it 'returns 0 for each attribute' do
-      allow(Gitlab::Geo::HealthCheck).to receive(:db_replication_lag).and_return(nil)
+      allow(Gitlab::Geo::HealthCheck).to receive(:db_replication_lag_seconds).and_return(nil)
       subject.attachments_count = nil
       subject.attachments_synced_count = nil
       subject.attachments_failed_count = nil
@@ -266,11 +277,11 @@ describe GeoNodeStatus do
       subject.repositories_synced_count = nil
       subject.repositories_failed_count = nil
       subject.last_event_id = nil
-      subject.last_event_date = nil
+      subject.last_event_timestamp = nil
       subject.cursor_last_event_id = nil
-      subject.cursor_last_event_date = nil
+      subject.cursor_last_event_timestamp = nil
 
-      expect(subject.db_replication_lag).to be_nil
+      expect(subject.db_replication_lag_seconds).to be_nil
       expect(subject.repositories_count).to be_zero
       expect(subject.repositories_synced_count).to be_zero
       expect(subject.repositories_synced_in_percentage).to be_zero
@@ -284,9 +295,9 @@ describe GeoNodeStatus do
       expect(subject.attachments_failed_count).to be_zero
       expect(subject.attachments_synced_in_percentage).to be_zero
       expect(subject.last_event_id).to be_nil
-      expect(subject.last_event_date).to be_nil
+      expect(subject.last_event_timestamp).to be_nil
       expect(subject.cursor_last_event_id).to be_nil
-      expect(subject.cursor_last_event_date).to be_nil
+      expect(subject.cursor_last_event_timestamp).to be_nil
     end
   end
 end

spec/services/geo/metrics_update_service_spec.rb

+require 'spec_helper'
+
+describe Geo::MetricsUpdateService, :geo do
+  include ::EE::GeoHelpers
+
+  subject { described_class.new }
+
+  let(:timestamp) { Time.now.to_i }
+
+  before do
+    allow(Gitlab::Metrics).to receive(:prometheus_metrics_enabled?).and_return(true)
+  end
+
+  describe '#execute' do
+    before do
+      data = {
+        health: 'OK',
+        db_replication_lag_seconds: 0,
+        repositories_count: 10,
+        repositories_synced_count: 1,
+        repositories_failed_count: 2,
+        lfs_objects_count: 100,
+        lfs_objects_synced_count: 50,
+        lfs_objects_failed_count: 12,
+        attachments_count: 30,
+        attachments_synced_count: 30,
+        attachments_failed_count: 25,
+        last_event_id: 2,
+        last_event_timestamp: timestamp,
+        cursor_last_event_id: 1,
+        cursor_last_event_timestamp: timestamp
+      }
+      request = double(success?: true, parsed_response: data.stringify_keys, code: 200)
+      allow(Geo::NodeStatusService).to receive(:get).and_return(request)
+    end
+
+    context 'when node is the primary' do
+      set(:primary) { create(:geo_node, :primary) }
+      set(:secondary) { create(:geo_node) }
+      set(:another_secondary) { create(:geo_node) }
+
+      before do
+        stub_current_geo_node(primary)
+      end
+
+      it 'attempts to retrieve metrics from all nodes' do
+        subject.execute
+
+        expect(Gitlab::Metrics.provide_metric(:geo_db_replication_lag_seconds).values.count).to eq(2)
+        expect(Gitlab::Metrics.provide_metric(:geo_repositories).values.count).to eq(2)
+        expect(Gitlab::Metrics.provide_metric(:geo_repositories).get({ url: secondary.url })).to eq(10)
+        expect(Gitlab::Metrics.provide_metric(:geo_repositories).get({ url: secondary.url })).to eq(10)
+      end
+    end
+
+    context 'when node is a secondary' do
+      set(:secondary) { create(:geo_node) }
+
+      subject { described_class.new }
+
+      before do
+        stub_current_geo_node(secondary)
+      end
+
+      it 'adds gauges for various metrics' do
+        subject.execute
+
+        expect(metric_value(:geo_db_replication_lag_seconds)).to eq(0)
+        expect(metric_value(:geo_repositories)).to eq(10)
+        expect(metric_value(:geo_repositories_synced)).to eq(1)
+        expect(metric_value(:geo_repositories_failed)).to eq(2)
+        expect(metric_value(:geo_lfs_objects)).to eq(100)
+        expect(metric_value(:geo_lfs_objects_synced)).to eq(50)
+        expect(metric_value(:geo_lfs_objects_failed)).to eq(12)
+        expect(metric_value(:geo_attachments)).to eq(30)
+        expect(metric_value(:geo_attachments_synced)).to eq(30)
+        expect(metric_value(:geo_attachments_failed)).to eq(25)
+        expect(metric_value(:geo_last_event_id)).to eq(2)
+        expect(metric_value(:geo_last_event_timestamp)).to eq(timestamp.to_i)
+        expect(metric_value(:geo_cursor_last_event_id)).to eq(1)
+        expect(metric_value(:geo_cursor_last_event_timestamp)).to eq(timestamp.to_i)
+        expect(metric_value(:geo_status_last_updated_timestamp)).to be_truthy
+      end
+
+      it 'increments a counter when metrics fail to retrieve' do
+        allow(subject).to receive(:node_status).and_return(GeoNodeStatus.new(success: false))
+
+        # Run once to get the gauge set
+        subject.execute
+
+        expect { subject.execute }.to change { metric_value(:geo_status_failed_total) }.by(1)
+      end
+
+      def metric_value(metric_name)
+        Gitlab::Metrics.provide_metric(metric_name).get({ url: secondary.url })
+      end
+    end
+  end
+end

spec/services/geo/node_status_service_spec.rb

@@ -6,7 +6,7 @@ describe Geo::NodeStatusService do
 
   subject { described_class.new }
 
-  describe 'KEYS' do
+  describe '#status_keys' do
     it 'matches the serializer keys' do
       exceptions = %w[
         id
@@ -22,7 +22,7 @@ describe Geo::NodeStatusService do
         .keys
         .map(&:to_s) - exceptions
 
-      expect(described_class::KEYS).to match_array(expected)
+      expect(subject.status_keys).to match_array(expected)
     end
   end
 
@@ -41,7 +41,7 @@ describe Geo::NodeStatusService do
 
     it 'parses a 200 response' do
       data = { health: 'OK',
-               db_replication_lag: 0,
+               db_replication_lag_seconds: 0,
                repositories_count: 10,
                repositories_synced_count: 1,
                repositories_failed_count: 2,
@@ -52,15 +52,16 @@ describe Geo::NodeStatusService do
                attachments_synced_count: 30,
                attachments_failed_count: 25,
                last_event_id: 2,
-               last_event_date: Time.now,
+               last_event_timestamp: Time.now.to_i,
                cursor_last_event_id: 1,
-               cursor_last_event_date: Time.now }
+               cursor_last_event_timestamp: Time.now.to_i }
       request = double(success?: true, parsed_response: data.stringify_keys, code: 200)
       allow(described_class).to receive(:get).and_return(request)
 
       status = subject.call(secondary)
 
       expect(status).to have_attributes(data)
+      expect(status.success).to be true
     end
 
     it 'omits full response text in status' do
@@ -73,6 +74,7 @@ describe Geo::NodeStatusService do
       status = subject.call(secondary)
 
       expect(status.health).to eq("Could not connect to Geo node - HTTP Status Code: 401 Unauthorized\n")
+      expect(status.success).to be false
     end
 
     it 'alerts on bad SSL certficate' do

spec/workers/geo/metrics_update_worker_spec.rb

+require 'rails_helper'
+
+RSpec.describe Geo::MetricsUpdateWorker, :geo do
+  include ::EE::GeoHelpers
+
+  subject { described_class.new }
+
+  describe '#perform' do
+    let(:geo_node_key) { create(:geo_node_key) }
+    let(:secondary) { create(:geo_node, geo_node_key: geo_node_key) }
+
+    before do
+      stub_current_geo_node(secondary)
+    end
+
+    it 'does not execute when Prometheus metrics are disabled' do
+      allow(Gitlab::Metrics).to receive(:prometheus_metrics_enabled?).and_return(false)
+      expect(Geo::MetricsUpdateService).not_to receive(:new)
+
+      subject.perform
+    end
+
+    it 'executes when Prometheus metrics are enabled' do
+      allow(Gitlab::Metrics).to receive(:prometheus_metrics_enabled?).and_return(true)
+      expect(Geo::MetricsUpdateService).to receive(:new).and_call_original
+
+      subject.perform
+    end
+  end
+end