Add support for Logical_Op to grep filter

[marevers]

Fluent Bit 2.1 has a new parameter for the grep filter plugin: Logical_Op. With that parameter it is possible to include multiple regex matchers in a single filter and choose what logical operation should be use to combine these matchers. More information: Fluent Bit Manual - Grep

E.g.

[FILTER]
    Name       grep
    Match      *
    Regex      log foo
    Regex      log bar
    Logical_Op OR

It would be nice if aws-for-fluent-bit would support this also in the future.

[PettitWesley]

Please post this here in the 2.0 requests tracker: #494

[hoazgazh]

still waiting for Logical_Op on aws-for-fluent-bit