I just confirmed that this issue also exists for Debian 9:
```
user@disp5874:~$ sudo su -
root@disp5874:~# cat /etc/issue
Debian GNU/Linux 9 \n \l
root@disp5874:~# apt-get install varnish munin
...
root@disp5874:~# echo -e '\n[varnish*]\nuser root\n' >
/etc/munin/plugin-conf.d/z-varnish
root@disp5874:~# munin-run --debug --pidebug varnish_uptime
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_uptime'
root@disp5874:~# vim /usr/share/munin/plugins/varnish_
root@disp5874:~# munin-run --debug --pidebug varnish_uptime
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_uptime'
Error: uptime not part of varnishstat.
root@disp5874:~# ~
```
And here's the rest of the objects. Note that varnish_memory_usage actually
does get some of its values; most don't.
```
root@disp5874:~# munin-run --debug --pidebug varnish_objects
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_objects'
Error: n_objecthead not part of varnishstat.
Error: n_objcore not part of varnishstat.
Error: n_object not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_backend_traffic
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_backend_traffic'
Error: backend_conn not part of varnishstat.
Error: backend_reuse not part of varnishstat.
Error: backend_fail not part of varnishstat.
Error: backend_recycle not part of varnishstat.
Error: backend_req not part of varnishstat.
Error: backend_unused not part of varnishstat.
Error: backend_unhealthy not part of varnishstat.
Error: backend_busy not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_bad
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_bad'
Error: n_objoverflow not part of varnishstat.
SMA_s0_c_fail.value 0
SMA_Transient_c_fail.value 0
Error: n_wrk_failed not part of varnishstat.
Error: n_wrk_lqueue not part of varnishstat.
Error: client_drop not part of varnishstat.
Error: client_drop_late not part of varnishstat.
Error: backend_unhealthy not part of varnishstat.
Error: accept_fail not part of varnishstat.
Error: fetch_failed not part of varnishstat.
Error: n_wrk_drop not part of varnishstat.
Error: n_wrk_max not part of varnishstat.
Error: backend_busy not part of varnishstat.
Error: esi_warnings not part of varnishstat.
Error: losthdr not part of varnishstat.
Error: esi_errors not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_expunge
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_expunge'
Error: n_expired not part of varnishstat.
Error: n_lru_nuked not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_hit_rate
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_hit_rate'
Error: client_req not part of varnishstat.
Error: cache_hit not part of varnishstat.
Error: cache_miss not part of varnishstat.
Error: cache_hitpass not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_memory_usage
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_memory_usage'
Error: sma_nbytes not part of varnishstat.
Error: sms_nbytes not part of varnishstat.
SMA_Transient_g_bytes.value 0
SMA_s0_g_bytes.value 0
Error: sm_balloc not part of varnishstat.
SMA_Transient_g_space.value 0
SMA_s0_g_space.value 268435456
root@disp5874:~# munin-run --debug --pidebug varnish_objects
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_objects'
Error: n_objecthead not part of varnishstat.
Error: n_object not part of varnishstat.
Error: n_objcore not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_request_rate
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_request_rate'
Error: client_req not part of varnishstat.
Error: backend_conn not part of varnishstat.
Error: cache_hit not part of varnishstat.
Error: client_conn not part of varnishstat.
Error: cache_hitpass not part of varnishstat.
Error: cache_miss not part of varnishstat.
Error: s_pipe not part of varnishstat.
Error: backend_unhealthy not part of varnishstat.
Error: s_pass not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_threads
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_threads'
Error: n_wrk_max not part of varnishstat.
Error: n_wrk_drop not part of varnishstat.
Error: n_wrk_failed not part of varnishstat.
Error: n_wrk_overflow not part of varnishstat.
Error: n_wrk_create not part of varnishstat.
Error: n_wrk not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_transfer_rates
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_transfer_rates'
Error: s_hdrbytes not part of varnishstat.
Error: s_bodybytes not part of varnishstat.
root@disp5874:~# munin-run --debug --pidebug varnish_uptime
# Processing plugin configuration from /etc/munin/plugin-conf.d/munin-node
# Processing plugin configuration from /etc/munin/plugin-conf.d/z-varnish
# Setting /rgid/ruid/ to /123/0/
# Setting /egid/euid/ to /123 123/0/
# Setting up environment
# About to run '/etc/munin/plugins/varnish_uptime'
Error: uptime not part of varnishstat.
root@disp5874:~#
```
And a subset of `varnihsstat -x`
```
root@disp5874:~# varnishstat -x | grep -EiC4 'uptime|SMA'
<?xml version="1.0"?>
<varnishstat timestamp="2020-05-05T23:16:33">
<stat>
<type>MAIN</type>
<name>uptime</name>
<value>1194</value>
<flag>c</flag>
<format>d</format>
<description>Child process uptime</description>
</stat>
<stat>
<type>MAIN</type>
<name>sess_conn</name>
--
<description>Overflowed VSM space</description>
</stat>
<stat>
<type>MGT</type>
<name>uptime</name>
<value>1194</value>
<flag>c</flag>
<format>d</format>
<description>Management process uptime</description>
</stat>
<stat>
<type>MGT</type>
<name>child_start</name>
--
</stat>
<stat>
<type>MEMPOOL</type>
<ident>busyobj</ident>
<name>toosmall</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Too small to recycle</description>
</stat>
<stat>
<type>MEMPOOL</type>
<ident>busyobj</ident>
--
</stat>
<stat>
<type>MEMPOOL</type>
<ident>req0</ident>
<name>toosmall</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Too small to recycle</description>
</stat>
<stat>
<type>MEMPOOL</type>
<ident>req0</ident>
--
</stat>
<stat>
<type>MEMPOOL</type>
<ident>sess0</ident>
<name>toosmall</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Too small to recycle</description>
</stat>
<stat>
<type>MEMPOOL</type>
<ident>sess0</ident>
--
</stat>
<stat>
<type>MEMPOOL</type>
<ident>req1</ident>
<name>toosmall</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Too small to recycle</description>
</stat>
<stat>
<type>MEMPOOL</type>
<ident>req1</ident>
--
</stat>
<stat>
<type>MEMPOOL</type>
<ident>sess1</ident>
<name>toosmall</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Too small to recycle</description>
</stat>
<stat>
<type>MEMPOOL</type>
<ident>sess1</ident>
--
<format>i</format>
<description>Pool ran dry</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>c_req</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Allocator requests</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>c_fail</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Allocator failures</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>c_bytes</name>
<value>0</value>
<flag>c</flag>
<format>B</format>
<description>Bytes allocated</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>c_freed</name>
<value>0</value>
<flag>c</flag>
<format>B</format>
<description>Bytes freed</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>g_alloc</name>
<value>0</value>
<flag>g</flag>
<format>i</format>
<description>Allocations outstanding</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>g_bytes</name>
<value>0</value>
<flag>g</flag>
<format>B</format>
<description>Bytes outstanding</description>
</stat>
<stat>
<type>SMA</type>
<ident>s0</ident>
<name>g_space</name>
<value>268435456</value>
<flag>g</flag>
<format>B</format>
<description>Bytes available</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>c_req</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Allocator requests</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>c_fail</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Allocator failures</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>c_bytes</name>
<value>0</value>
<flag>c</flag>
<format>B</format>
<description>Bytes allocated</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>c_freed</name>
<value>0</value>
<flag>c</flag>
<format>B</format>
<description>Bytes freed</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>g_alloc</name>
<value>0</value>
<flag>g</flag>
<format>i</format>
<description>Allocations outstanding</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>g_bytes</name>
<value>0</value>
<flag>g</flag>
<format>B</format>
<description>Bytes outstanding</description>
</stat>
<stat>
<type>SMA</type>
<ident>Transient</ident>
<name>g_space</name>
<value>0</value>
<flag>g</flag>
--
<description>Lock Operations</description>
</stat>
<stat>
<type>LCK</type>
<ident>sma</ident>
<name>creat</name>
<value>2</value>
<flag>c</flag>
<format>i</format>
<description>Created locks</description>
</stat>
<stat>
<type>LCK</type>
<ident>sma</ident>
<name>destroy</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
<description>Destroyed locks</description>
</stat>
<stat>
<type>LCK</type>
<ident>sma</ident>
<name>locks</name>
<value>0</value>
<flag>c</flag>
<format>i</format>
root@disp5874:~#
```
