Missing fields in procstat output

[andrii-rymar]

Bug report

It looks like the same problem as was mentioned in #1584 - IO and 2 other procstat metrics are missing in the resulting output.
The full list: num_fds, involuntary_context_switches, read_count, write_count, read_bytes are write_bytes.

Relevant telegraf.conf:

[[inputs.procstat]]
pattern = "test"

System info:

Checked with Telegraf 1.2.0-1 and 1.2.1-1 on CentOS 6.5/7 x64

Steps to reproduce:

1. Setup procstat input in telegraf.conf
2. Start telegraf
3. Check DB for fields.

Expected behavior:

Presence of all fields mentioned in the procstat readme.

Actual behavior:

Several fields are missing:

• num_fds
• involuntary_context_switches
• read_count
• write_count
• read_bytes
• write_bytes.

[sparrc]

this is probably a permissions issue, have you tried running telegraf as root or with sudo privileges? if you're running as a service then the telegraf user needs access to the entire procfs filesystem.

[sparrc]

see #1300

[andrii-rymar]

I see. And confirm that running telegraf as root solves the issue.