enable 1.9 support

Author: yaacov

.travis.yml

@@ -5,6 +5,7 @@ before_install:
   - |
     if [[ "$(ruby -e 'puts RUBY_VERSION')" != 1.* ]]; then gem update --system; fi
 rvm:
+  - 1.9.3
   - 2.3.3
   - 2.4.0
   - jruby-9.1.5.0

lib/prometheus/api_client/cadvisor.rb

@@ -20,7 +20,8 @@ module Cadvisor
       #
       # A default client is created if options is omitted.
       class Node < Client
-        def initialize(instance:, **options)
+        def initialize(**options)
+          instance = options[:instance]
           region = options[:region] || 'infra'
           zone = options[:zone] || 'default'
 
@@ -42,7 +43,8 @@ def query_range(options)
 
       # A client with special labels for pod cadvisor metrics
       class Pod < Client
-        def initialize(pod_name:, **options)
+        def initialize(**options)
+          pod_name = options[:pod_name]
           namespace = options[:namespace] || 'default'
           region = options[:region] || 'infra'
           zone = options[:zone] || 'default'
@@ -66,7 +68,9 @@ def query_range(options)
 
       # A client with special labels for container cadvisor metrics
       class Container < Client
-        def initialize(container_name:, pod_name:, **options)
+        def initialize(**options)
+          container_name = args[:container_name]
+          pod_name = args[:pod_name]
           namespace = args[:namespace] || 'default'
           region = options[:region] || 'infra'
           zone = options[:zone] || 'default'