What is the difference between structured metadata and label? If level label is intuitive and that cardinality is low then label or structured metadata? I confused, about this:
From early on, we have set a label dynamically using Promtail pipelines for level. This seemed intuitive for us as we often wanted to only show logs for level=“error”; however, we are re-evaluating this now as writing a query. {app=“loki”} |= “level=error” is proving to be just as fast for many of our applications as {app=“loki”,level=“error”}.
This may seem surprising, but if applications have medium to low volume, that label causes one application’s logs to be split into up to five streams, which means 5x chunks being stored. And loading chunks has an overhead associated with it. Imagine now if that query were {app=“loki”,level!=“debug”}. That would have to load way more chunks than {app=“loki”} != “level=debug”.
Can anyone write an example? I really confused about documentation. Can all labels set to structured metadata is good?