Hello:

I've compiled knot 2.2.1 and configured with the --enable-dnstap flag but continue to get errors when starting knot and configuring it to use dnstap to write to a file see below:

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./configure:

knot 2.2.1

Target: linux-gnu x86_64
Compiler: gcc -std=gnu99
CFLAGS: -g -O2 -Wall -Werror=format-security -Werror=implicit -fpredictive-commoning
LIBS: -lcap-ng -ldl -lpthread -lm
LibURCU: -lurcu
GnuTLS: -lgnutls -lnettle -I/usr/include/p11-kit-1
Jansson: -ljansson
Libedit: -ledit -I/usr/include/editline
LMDB: embedded

Sanitizer:
LibFuzzer: no

Prefix: /usr/local
Run dir: ${prefix}/var/run/knot
Storage dir: ${prefix}/var/lib/knot
Config dir: ${prefix}/etc/knot

Configuration DB mapsize: 500 MiB
Timers DB mapsize: 100 MiB

Knot DNS libraries: yes
Knot DNS daemon: yes
Knot DNS utils: yes
Knot DNS documentation: yes

Use SO_REUSEPORT: yes
Fast zone parser: no
Utilities with IDN: no
Systemd integration: no
Dnstap support: yes
Code coverage: no
Bash completions: no
PKCS 11 support: no

Continue with 'make' command

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/etc/knot.conf

server:
listen: 100.88.99.132
nsid: knot-2.2.1-dnsproxy-0.1.0

log:
- target: syslog
any: info

remote:
- id: authcore
address: 127.0.0.1@53535

mod-dnsproxy:
- id: sdt
remote: authcore

template:
- id: default
global-module: mod-dnsproxy/sdt

mod-dnstap:
- id: capture_all
sink: /tmp/dnstap.tap

template:
- id: default
global-module: mod-dnstap/capture_all

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knotc -c /etc/knot.conf reload

error: config, file '/etc/knot.conf', line 21, item 'mod-dnstap', value '' (invalid item)
error: failed to load configuration file '/etc/knot.conf' (invalid item)

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I've tried various configurations and have been using: https://www.knot-dns.cz/docs/2.x/html/configuration.html#dnstap-dnstap-enabled-query-logging as a guide.

What am I missing?