Added global rules to mask sensitive information using promtail (#48)

Added global rules to mask sensitive information such as ssn, creditcard number, email, ip, mobile number using promtail

Author: kaushall

charts/nopo11y-stack/Chart.yaml

@@ -48,4 +48,4 @@ dependencies:
 description: A Helm chart for observability stack
 name: nopo11y-stack
 type: application
-version: 2.2.0
+version: 2.2.1

charts/nopo11y-stack/values.yaml

@@ -15786,6 +15786,26 @@ promtail:
     snippets:
       pipelineStages:
         - cri: {}
+        - replace:
+            # SSN
+            expression: '([0-9]{3}-[0-9]{2}-[0-9]{4})'
+            replace: '*SSN*{{ .Value | Hash "salt" }}*'
+        - replace:
+            # IP4
+            expression: '(\d{1,3}[.]\d{1,3}[.]\d{1,3}[.]\d{1,3})'
+            replace: '*IP4*{{ .Value | Hash "salt" }}*'    
+        - replace:
+            # email
+            expression: '([\w\.=-]+@[\w\.-]+\.[\w]{2,64})'
+            replace: '*email*{{ .Value | Hash "salt" }}*'  
+        - replace:
+            # creditcard
+            expression: '((?:\d[ -]*?){13,16})'
+            replace: '*creditcard*{{ .Value | Hash "salt" }}*'
+        - replace:
+            # mobile number
+            expression: '(\+?\d{1,3}[-.\s]??\d{5}[-.\s]?\d{5})'
+            replace: '*mobile*{{ .Value | Hash "salt" }}*'
       common:
         - action: replace
           source_labels: