Fix trying to call .empty? on an integer

`slowlog_max_len` can be either int or string.

Author: albertvaka

spec/classes/datadog_agent_integrations_redis_spec.rb

@@ -48,7 +48,7 @@
           host: 'redis1',
           password: 'hunter2',
           port: 867,
-          slowlog_max_len: '5309',
+          slowlog_max_len: 5309,
           tags: %w{foo bar},
           keys: %w{baz bat},
           warn_on_missing_keys: false,
@@ -69,7 +69,7 @@
           host: 'redis1',
           password: 'hunter2',
           ports: %w(2379 2380 2381),
-          slowlog_max_len: '5309',
+          slowlog_max_len: 5309,
           tags: %w{foo bar},
           keys: %w{baz bat},
           warn_on_missing_keys: false,
@@ -87,6 +87,27 @@
         it { should contain_file(conf_file).with_content(%r{port: 2381}) }
       end
 
+      context 'with strings instead of ints' do
+        let(:params) {{
+          host: 'redis1',
+          password: 'hunter2',
+          port: '867',
+          slowlog_max_len: '5309',
+          tags: %w{foo bar},
+          keys: %w{baz bat},
+          warn_on_missing_keys: false,
+          command_stats: true,
+        }}
+        it { should contain_file(conf_file).with_content(%r{host: redis1}) }
+        it { should contain_file(conf_file).with_content(%r{^[^#]*password: hunter2}) }
+        it { should contain_file(conf_file).with_content(%r{port: 867}) }
+        it { should contain_file(conf_file).with_content(%r{^[^#]*slowlog-max-len: 5309}) }
+        it { should contain_file(conf_file).with_content(%r{tags:.*\s+- foo\s+- bar}) }
+        it { should contain_file(conf_file).with_content(%r{keys:.*\s+- baz\s+- bat}) }
+        it { should contain_file(conf_file).with_content(%r{warn_on_missing_keys: false}) }
+        it { should contain_file(conf_file).with_content(%r{command_stats: true}) }
+      end
+
       context 'with instances set' do
         let(:params) {{
           instances: [

templates/agent-conf.d/redisdb.yaml.erb

@@ -9,7 +9,7 @@ instances:
 <% if instance['password']  and ! instance['password'].empty? -%>
     password: <%= instance['password'] %>
 <% end -%>
-<% if instance['slowlog_max_len']  and ! instance['slowlog_max_len'].empty? -%>
+<% if instance['slowlog_max_len'] and ! instance['slowlog_max_len'].to_s.empty? -%>
     # unix_socket_path: /var/run/redis/redis.sock # optional, can be used in lieu of host/port
     slowlog-max-len: <%= instance['slowlog_max_len'] %>
 <% end -%>