feat(loki): adding multiline support

[abhilashshetty04]

With multiline support we define starting point of the log block when it gets filtered through logcli parameter.

Every log that we stdout starts with timestamp(with ansi color char now by default) . In Regex1 , \x1b\[2m matches colour unicode pattern. logger adds 2 zero width space also hence Regex has space to match.

We might have uncolored timestamp in future. So In Regex2, we handle that scenario.

Regex1: '^ \x1b[2m(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}).(\d{6})Z'

Regex2 : '^ (\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}).(\d{6})Z'

[tiagolobocastro]

@abhilashshetty04 please add more information to commit explaining what the regex is doing in both cases.

[abhilashshetty04]

bors merge

[bors]

👎 Rejected by too few approved reviews

[niladrih]

This will require upgrade changes, noted 👍 .

[abhilashshetty04]

bors merge

[bors]

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