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, 1 deletions

diff --git a/spec/services/prometheus/proxy_service_spec.rb b/spec/services/prometheus/proxy_service_spec.rb
index 4bdb20de4c9..03bda94e9c6 100644
--- a/spec/services/prometheus/proxy_service_spec.rb
+++ b/spec/services/prometheus/proxy_service_spec.rb
@@ -131,7 +131,7 @@ describe Prometheus::ProxyService do
         allow(environment).to receive(:prometheus_adapter)
           .and_return(prometheus_adapter)
         allow(prometheus_adapter).to receive(:can_query?).and_return(true)
-        allow(prometheus_adapter).to receive(:prometheus_client_wrapper)
+        allow(prometheus_adapter).to receive(:prometheus_client)
           .and_return(prometheus_client)
       end