New driver options:
- `splunk-gzip` - gzip compress all requests to Splunk HEC
(enabled by default)
- `splunk-gzip-level` - change compression level.
Messages are sent in batches by 1000, with frequency of 5 seconds.
Maximum buffer is 10,000 events. If HEC will not be available, Splunk
Logging Driver will keep retrying while it can hold messages in buffer.
Added unit tests for driver.
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
`--log-opt splunk-format=inline|json|raw` allows to change how logging
driver sends data to Splunk, where
`inline` - default value, format used before, message is injected as a
line in JSON payload
`json` - driver will try to parse each line as a JSON object and embed it
inside of the JSON payload
`raw` - driver will send Raw payload instead of JSON, tag and attributes
will be prefixed before the message
`--log-opt splunk-verify-connection=true|false` - allows to skip
verification for Splunk Url
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
Add support of `tag`, `env` and `labels` for Splunk logging driver.
Removed from message `containerId` as it is the same as `tag`.
Signed-off-by: Denis Gladkikh <denis@gladkikh.email>
