chore: enable promlinter linter

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

Author: mmorel-35

.golangci.yml

@@ -8,12 +8,16 @@ linters:
   enable:
     - errcheck
     - misspell
+    - promlinter
 
   settings:
     errcheck:
       exclude-functions:
         - (github.com/go-kit/log.Logger).Log
 
+    promlinter:
+      strict: true
+
   exclusions:
     presets:
       - comments