// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

/*
Package instance provides the functions required to manage the life-cycle of a Beat.
It provides the standard mechanism for launching a Beat. It manages
configuration, logging, and publisher initialization and registers a signal
handler to gracefully stop the process.

Each Beat implementation must implement the `Beater` interface and a `Creator`
to create and initialize the Beater instance. See the `Beater` interface and `Creator`
documentation for more details.

To use this package, create a simple main that invokes the Run() function.

  func main() {
  	if err := beat.Run("mybeat", myVersion, beater.New); err != nil {
  		os.Exit(1)
  	}
  }

In the example above, the beater package contains the implementation of the
Beater interface and the New method returns a new instance of Beater. The
Beater implementation is placed into its own package so that it can be reused
or combined with other Beats.

Recommendations

  * Use the logp package for logging rather than writing to stdout or stderr.
  * Do not call os.Exit in any of your code. Return an error instead. Or if your
    code needs to exit without an error, return beat.GracefulExit.
*/
package instance