See merge request !7

Allow to use a fluentd version < 2.0.0

See merge request !6

Since c1ff3f19ddb80996751d05d0468fe81ad8167243 in Wendelin's repo a default HTTTP / JSON is added by default to every Wendelin instance. Thus use as an example policy.

Simplify configuration by leaving only the necessary and prepare file to be used for a Wendelin fluentd tutorial.

This can be used for single_value fromatting to send data exactly as read from file

All tabs are converted to spaces, no more unnecessary white spaces.

/reviewed-on nexedi/fluent-plugin-wendelin!5

nexedi/fluent-plugin-wendelin!2 (comment 63248)

fluent-plugin-wendelin: separate connection establishment and request. The rest of the issues is not addressed yet.

This depends on nexedi/wendelin!28.

/reviewed-on nexedi/fluent-plugin-wendelin!1

Else `gem build` complains:

    WARNING:  WARNING: license value 'APLv2' is invalid.  Use a license identifier from
    http://spdx.org/licenses or 'Nonstandard' for a nonstandard license.

Net::HTTP has default infinite timeout for opening connection, which,
when other side does not open connection fully, nor rejects connecting,
results in infinite thread hang without any reporting into log.

Fix it by explicitly making all timeouts finite (set to default
Net::HTTP's read_timeout 60 seconds).

/cc @klaus

Previously WendelinClient's tracing was controlled by global $trace
variable and was not correlated to current Fluentd log level, or current
plugin log level and thus it was harder for users to use.

Improve it and rework the tracing to use fluentd logging infrastructure.

This way tracing is disabled by default, but can be either globally
enabled with

    fluentd -v -v

or only for wendelin_out plugin via adding

    log_level   trace

to <match ...> section which routes messages to wendelin_out.

/cc @klaus

Instead of ingesting just [1,2,'hello'] list, ingest in format closer to what
fluentd sends - i.e. "t" and dict/hash of name->value pairs.

This was pre-tested and know to ingest data ok, modulo some known TODO.