When tagging jmx instance with boolean value, jmx fetch has issues.

[jamiely]

This is with the jmxfetch version in DataDog agent 5.18.1, 0.17.0?

 Running java -Xms50m -Xmx200m -classpath /opt/datadog-agent/agent/checks/libs/jmxfetch-0.17.0-jar-with-dependencies.jar
 org.datadog.jmxfetch.App --check jmx.yaml --check_period 15000 --conf_directory /etc/dd-agent/conf.d --log_level INFO --log_location /var/log/datadog/jmxfetch.log --reporter console --status_loc
ation /opt/datadog-agent/run/jmx_status.yaml list_everything

Reproduction steps:

1. create a jmx config like:

init_config:
instances:
  - host: localhost
     port: 19000
     tags:
       good: yes

2. Run sudo /etc/init.d/datadog-agent jmx list_everything

There will be an error like:

Exception in thread "main" java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
        at org.datadog.jmxfetch.Instance.getServiceCheckTags(Instance.java:401)
        at org.datadog.jmxfetch.App.sendServiceCheck(App.java:520)
        at org.datadog.jmxfetch.App.init(App.java:587)
        at org.datadog.jmxfetch.App.main(App.java:126)

Workaround:

Quote the value

init_config:
instances:
  - host: localhost
     port: 19000
     tags:
       good: "yes"