Convert RestClient to Gitlab::HTTP for Prometheus Monitor

- Closes #60024

- Change PrometheusClient.new to accept a base url instead of an
  already created RestClient

- Use Gitlab::HTTP in PrometheusClient instead of creating RestClient
  in PrometheusService

- Move http_options from PrometheusService to
  PrometheusClient (follow_redirects: false)

- ensure that base urls don't have the trailing slash

- Created a `PrometheusClient#url` method that might not be strictly
  required

- Change rescued exceptions from RestClient::* to
  HTTParty::ResponseError where possible and StandardError for the
  rest

1 files changed, 1 insertions, 5 deletions

diff --git a/app/models/concerns/prometheus_adapter.rb b/app/models/concerns/prometheus_adapter.rb
index c2542dbe743..9ac4722c6b1 100644
--- a/app/models/concerns/prometheus_adapter.rb
+++ b/app/models/concerns/prometheus_adapter.rb
@@ -14,10 +14,6 @@ module PrometheusAdapter
       raise NotImplementedError
     end
 
-    def prometheus_client_wrapper
-      Gitlab::PrometheusClient.new(prometheus_client)
-    end
-
     def can_query?
       prometheus_client.present?
     end
@@ -35,7 +31,7 @@ module PrometheusAdapter
     def calculate_reactive_cache(query_class_name, *args)
       return unless prometheus_client
 
-      data = Object.const_get(query_class_name, false).new(prometheus_client_wrapper).query(*args)
+      data = Object.const_get(query_class_name, false).new(prometheus_client).query(*args)
       {
         success: true,
         data: data,