Revert "Merge branch 'add-prometheus-metrics-endpoint'"

This reverts commit e5c0f15 due to
iv-org/invidious#3576 (comment)
, reversing changes made to ecacbab.

Author: Fijxu

src/invidious.cr

@@ -190,7 +190,6 @@ end
 
 if CONFIG.statistics_enabled
   Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, SOFTWARE)
-  add_handler Metrics::RouteMetricsCollector.new
 end
 
 if (CONFIG.use_pubsub_feeds.is_a?(Bool) && CONFIG.use_pubsub_feeds.as(Bool)) || (CONFIG.use_pubsub_feeds.is_a?(Int32) && CONFIG.use_pubsub_feeds.as(Int32) > 0)

src/invidious/helpers/helpers.cr

@@ -198,11 +198,3 @@ def get_playback_statistic
 
   return tracker.as(Hash(String, Int64 | Float64))
 end
-
-def to_prometheus_metrics(metrics_struct : Hash(String, Number)) : String
-  return String.build do |str|
-    metrics_struct.each.each do |key, value|
-      str << key << " " << value << "\n"
-    end
-  end
-end

src/invidious/jobs/statistics_refresh_job.cr

@@ -27,11 +27,6 @@ class Invidious::Jobs::StatisticsRefreshJob < Invidious::Jobs::BaseJob
     "playback" => {} of String => Int64 | Float64,
   }
 
-  STATISTICS_PROMETHEUS = {
-    "invidious_updated_at"                => Time.utc.to_unix,
-    "invidious_last_channel_refreshed_at" => 0_i64,
-  }
-
   private getter db : DB::Database
 
   def initialize(@db, @software_config : Hash(String, String))
@@ -64,9 +59,6 @@ class Invidious::Jobs::StatisticsRefreshJob < Invidious::Jobs::BaseJob
     users["activeHalfyear"] = Invidious::Database::Statistics.count_users_active_6m
     users["activeMonth"] = Invidious::Database::Statistics.count_users_active_1m
 
-    STATISTICS_PROMETHEUS["invidious_updated_at"] = Time.utc.to_unix
-    STATISTICS_PROMETHEUS["invidious_last_channel_refreshed_at"] = Invidious::Database::Statistics.channel_last_update.try &.to_unix || 0_i64
-
     STATISTICS["metadata"] = {
       "updatedAt"              => Time.utc.to_unix,
       "lastChannelRefreshedAt" => Invidious::Database::Statistics.channel_last_update.try &.to_unix || 0_i64,

src/invidious/metrics.cr

@@ -1,5 +1,3 @@
-require "../../../metrics.cr"
-
 module Invidious::Routes::API::V1::Misc
   # Stats API endpoint for Invidious
   def self.stats(env)
@@ -28,39 +26,6 @@ module Invidious::Routes::API::V1::Misc
     end
   end
 
-  def self.metrics(env)
-    if !CONFIG.statistics_enabled
-      env.response.status_code = 204
-      return
-    end
-
-    env.response.content_type = "text/plain"
-
-    return String.build do |str|
-      Metrics::RouteMetricsCollector.num_of_request_counters.each do |metric_labels, value|
-        str << "http_requests_total{"
-        str << "method=\"" << metric_labels.request_method << "\" "
-        str << "route=\"" << metric_labels.request_route << "\" "
-        str << "response_code=\"" << metric_labels.response_code << "\""
-        str << "} "
-        str << value << "\n"
-      end
-
-      Metrics::RouteMetricsCollector.request_duration_seconds_sums.each do |metric_labels, value|
-        str << "http_request_duration_seconds_sum{"
-        str << "method=\"" << metric_labels.request_method << "\" "
-        str << "route=\"" << metric_labels.request_route << "\" "
-        str << "response_code=\"" << metric_labels.response_code << "\""
-        str << "} "
-        str << value << "\n"
-      end
-
-      Invidious::Jobs::StatisticsRefreshJob::STATISTICS_PROMETHEUS.each.each do |key, value|
-        str << key << " " << value << "\n"
-      end
-    end
-  end
-
   # APIv1 currently uses the same logic for both
   # user playlists and Invidious playlists. This means that we can't
   # reasonably split them yet. This should be addressed in APIv2

src/invidious/routes/api/v1/misc.cr

@@ -312,7 +312,6 @@ module Invidious::Routing
 
       # Misc
       get "/api/v1/stats", {{namespace}}::Misc, :stats
-      get "/api/v1/metrics", {{namespace}}::Misc, :metrics
       get "/api/v1/playlists/:plid", {{namespace}}::Misc, :get_playlist
       get "/api/v1/auth/playlists/:plid", {{namespace}}::Misc, :get_playlist
       get "/api/v1/mixes/:rdid", {{namespace}}::Misc, :mixes