Update prometheus Docker image
What does this Merge Request do?
The prometheus service in GDK uses a docker image. This is a hard-coded tag, currently 2.8.1
.
2.8.1 is roughly two years old, so it seems reasonable to update this to the latest stable tag, from about 6 days ago.
Merge Request checklist
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Tests added for new functionality. If not, please raise Issue to follow-up. -
This change is backward compatible. If not, please include steps to communicate to our users. -
Documentation added/updated, if needed. -
gdk doctor
test added, if needed.