Unable to install Prometheus on Clusters: 'Error: Chart incompatible with Tiller v2.7.0'

Summary

Prometheus chart was updated, making the app incompatible with Tiller 2.7.0

Steps to reproduce

1 - Create a cluster

2 - Install Helm

3 - Install Prometheus

You'll get the following error:

Something went wrong while installing Prometheus

- Error: Chart incompatible with Tiller v2.7.0

What is the current bug behavior?

It's not possible to install Prometheus

What is the expected correct behavior?

We should be able to install Prometheus without any problem

Output of checks

This bug happens on GitLab.com

Possible fixes

A possible fix would be to update our values.yaml file: https://gitlab.com/gitlab-org/gitlab-ee/blob/master/vendor/prometheus/values.yaml