Bump Prometheus to v3.0.0

Tested with OpenFaaS for Enterprises with:
* scale to zero
* metrics for CPU/RAM and invocations in UI/CLI/API
* autoscaling horizontally
* Grafana dashboards

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>

Author: alexellis

chart/openfaas/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 type: application
 description: OpenFaaS - Serverless Functions Made Simple
 name: openfaas
-version: 14.2.80
+version: 14.2.81
 sources:
 - https://github.com/openfaas/faas
 - https://github.com/openfaas/faas-netes

chart/openfaas/values.yaml

@@ -365,7 +365,7 @@ iam:
 ## if you wish to retain the metrics for a longer period, you should
 ## scrape this instance from an external Prometheus server
 prometheus:
-  image: prom/prometheus:v2.54.0
+  image: prom/prometheus:v3.0.0
   create: true
   retention:
     time: 15d