Mask lock stats PII in CloudSpannerReceiver

[architjugran]

Component(s)

receiver/googlecloudspanner

Is your feature request related to a problem? Please describe.

Feature request:
When monitoring Cloud Spanner statics by using Cloud Spanner receiver , one of our customers would like to mask PII information which included labels metrics as row_range_start_key so that development engineers can tune or debug Cloud Spanner based on statics metrics like Query statistics, Read statistics, Transaction statistics, Lock statistics and others.

Context:
Metrics collected by Cloud Spanner receiver could include PII data in their labels row_range_start_key is used as label in the lock-stats metric.

Customer is ok for the system tables to include PII data as labels but would not like to export that information to the backend.

Describe the solution you'd like

Add a configurable option to mask the PII in lock stats metrics for customers.

For the metric "top minute lock stats", the label "row_range_start_key" (https://cloud.google.com/spanner/docs/introspection/lock-statistics#explain-row-range) has PII information of table key values. We can give the ability to hash the keys individually such that
table_name(key1,key2) becomes table_name(hash1,hash2).
Note that even though key values are hashed, a user can identify if sets of keys share common prefix like table1(key1,key2) and table1(key1,key3)

Describe alternatives you've considered

Workarounds explored :
Redaction processor would not work for my use-case .
Reason being I want to modify the value of the metric label in a certain manner.

Example: if value is "Table_name(key1, key2, key1...)" , i will modify it to be "Table_name(hash1, hash2, hash1...)" if the user wants to. As you can see, each key will correspond to a hashed value, and table_name will not be hashed.
Hence I don't think above functionality is possible via redaction processor.

Additional context

No response

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