[Request] Apply dynamic filter to all sub-tables

[llamafilm]

Host operating system: output of uname -a

Linux grafanatest-i-056a1b7f8d5405c62 5.19.0-1028-aws #29~22.04.1-Ubuntu SMP Tue Jun 20 19:12:11 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

snmp_exporter version: output of snmp_exporter -version

v0.22.0

What device/snmpwalk OID are you using?

Sony PROV1-LEDDISPLAY-MIB.txt

I'm monitoring an LED wall controller which can support up to 72 display units. Even if it's less than fully populated, SNMP tables always return 72 rows. I want to query several SNMP tables, only exporting metrics for those devices that exist. I can check the existence with a dynamic filter for the model number OID 1.3.6.1.4.1.122.8501.3.128.1.2.1.4. But I have to do this separately for every column of every table, which makes my generator config very complex. Below is a small example of just one table:

modules:
  cled:
    walk:
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.1
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.2
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.3
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.5
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.6
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.7
      - 1.3.6.1.4.1.122.8501.3.128.8.2.1.8
    version: 2
    filters:
      dynamic:
        - oid: 1.3.6.1.4.1.122.8501.3.128.1.2.1.4
          targets:
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.1"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.2"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.3"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.5"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.6"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.7"
            - "1.3.6.1.4.1.122.8501.3.128.8.2.1.8"
          values: ["ZRD-2"]

Request

Could we have an option where dynamic filters apply to all sub-tables? Then I could replace the above config with:

modules:
  cled:
    walk:
      - 1.3.6.1.4.1.122.8501.3.128.8.2
    version: 2
    filters:
      dynamic:
        - oid: 1.3.6.1.4.1.122.8501.3.128.1.2.1.4
          targets:
            - "1.3.6.1.4.1.122.8501.3.128.8.2"
          values: ["ZRD-2"]