Reuben Pereira authored Dec 09, 2019 and Thong Kuah committed Dec 09, 2019

Create new service to do template variable replacement on the query
parameter of the Prometheus proxy API.

Mass-replace set for let_it_be.

Some of the specs were using namespace names instead of paths for
building URLS. This would fail since we now build a namespace with a
user's name instead of a user's username.

Some of the specs were using namespace names instead of paths for
building URLS. This would fail since we now build a namespace with a
user's name instead of a user's username.

- In prometheus proxy api, allow variables to be replaced. For example,
if 'up{env="%{ci_environment_slug}"}' is passed to the endpoint, it
becomes 'up{env="production"}' before being sent to prometheus.

The names can change in different runs of the spec.

- It is now being done in ProxyService class.

The api will proxy requests to the environment's prometheus server.
The Prometheus::ProxyService class can be reused when we add support for
group prometheus servers.

The names can change in different runs of the spec.

- It is now being done in ProxyService class.

The api will proxy requests to the environment's prometheus server.
The Prometheus::ProxyService class can be reused when we add support for
group prometheus servers.