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          metrics: { include: metrics/* }

- underlay

    Merges specified configuration parameters with parameters located at the same
    context. Configuration parameters from the context overrides parameters from
    the directive. `underlay` directive most usefull in combination with `var`
    and `include` directives.

    For example, you can use this directive to set default values of parameters.

        myapp:
          db:
            connectors:
              default:
                port:   "1234"
                dbname: "stat"
                options:
                  PrintWarn:  0
                  PrintError: 0
                  RaiseError: 1

              stat_master:
                underlay: { var: .default }
                host:     "stat-master.mydb.com"
                username: "stat_writer"
                password: "stat_writer_pass"

              stat_slave:
                underlay: { var: .default }
                host:     "stat-slave.mydb.com"
                username: "stat_reader"
                password: "stat_reader_pass"

    You can move default parameters in separate files.

        myapp:
          db:
            connectors:
              underlay:
                - { include: db_connectors/default.yml }
                - { include: db_connectors/default_test.yml }

              stat_master:
                underlay: { var: .default }
                host:     "stat-master.mydb.com"
                username: "stat_writer"
                password: "stat_writer_pass"

              stat_slave:
                underlay: { var: .default }
                host:     "stat-slave.mydb.com"
                username: "stat_reader"
                password: "stat_reader_pass"

              test:
                underlay: { var: .default_test }
                username: "test"
                password: "test_pass"

- overlay

    Merges specified configuration parameters with parameters located at the same
    context. Configuration parameters from the directive overrides parameters from
    the context. `overlay` directive most usefull in combination with `var` and
    `include` directives.

    For example, you can use `overlay` directive to temporaly overriding regular
    configuration parameters.

        myapp:
          db:
            connectors:
              default:
                port:   "1234"
                dbname: "stat"
                options:
                  PrintWarn:  0
                  PrintError: 0
                  RaiseError: 1

              test:
                host: "localhost"
                port: "4321"

              stat_master:
                underlay: { var: .default }
                host:     "stat-master.mydb.com"
                username: "stat_writer"
                password: "stat_writer_pass"
                overlay:  { var: .test }

              stat_slave:
                underlay: { var: .default }
                host:     "stat-slave.mydb.com"
                username: "stat_reader"
                password: "stat_reader_pass"
                overlay:  { var: .test }

    To disable overriding just assign to `test` connector empty hash.

        test: {}

# AUTHOR

Eugene Ponizovsky, <ponizovsky@gmail.com>

# COPYRIGHT AND LICENSE

Copyright (c) 2016-2018, Eugene Ponizovsky, <ponizovsky@gmail.com>.
All rights reserved.

This module is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.