Errors in log should be more explicit

[yellowmegaman]

Bug report

I'm using telegraf to gather metrics from cassandra via jolokia. When some metric is no longer available ( cassandra version change), all i get - URL returned with status 404

Relevant telegraf.conf:

[[outputs.influxdb]]
  urls = ["http://influxdb.service:8086"]
  database = "telegraf_some"
  retention_policy = ""
  write_consistency = "any"
  timeout = "5s"
[[inputs.cassandra]]
  name_prefix = "some_"
  context = "/jolokia/read"
  servers = ["some:some@localhost:8778"]
  metrics  = [
    ...
    "/org.apache.cassandra.metrics:type=ReadRepair,name=Attempted",
    "/org.apache.cassandra.metrics:type=ReadRepair,name=RepairedBackground",
    "/org.apache.cassandra.metrics:type=ReadRepair,name=RepairedBlocking"
    ...

System info:

cassandra in docker container (1.13) on debian system (jessie)
Telegraf 1.2.1-1

Steps to reproduce:

1. use config above
2. telegraf --debug -config /tmp/tele.conf
3. ReadRepair metrics are not available, and even in debug mode all i see is URL returned with status 404.

Expected behavior:

URL returned with status 404 - host:port/jolokia/link_that_failed

Actual behavior:

URL returned with status 404

Feature Request

Please make 404 error more explicit

Thanks a lot in advance!

[danielnelson]

Will be included in 1.4 release.