Need to add field dynamically about logstash-json HOT 2 CLOSED

There is https://hexdocs.pm/logger/Logger.html#configure_backend/2, however this will restart the logger backend which can lead to lost messages, so I would not recommend doing it often.

Another option would be to list metadata fields not as subfields under metadata (metadata.field) but directly at root level (field). This is my preferred option, it seems to fit the actual use case for metadata better. And, it would allow you to set permanent fields per process using https://hexdocs.pm/logger/Logger.html#metadata/1. Would this work well for you?

We could also add some API to the LogstashJson module to accomplish this, but I would prefer to make this library work well with the standard Logger library.

from logstash-json.

We only need to do this once, on application startup so [Logger.configure_backend/2]
(https://hexdocs.pm/logger/Logger.html#configure_backend/2) should be sufficient.

I put together a proof-of-concept which included the following:

logstash_config = Application.get_env(:logger, :logstash)
logstash_fields = Map.put(logstash_config[:fields], "my_new_field", "my_new_value")
Logger.configure_backend({LogstashJson.TCP, :logstash}, [fields: logstash_fields])

When this is run on application startup, the new field/value "my_new_field" is included in all log messages.

Thanks for the help!

from logstash-json.