[BUG] generate_dashboards fail `jinja2.exceptions.UndefinedError: 'GF_LOKI_DATASOURCE_NAME' is undefined`

[zcola]

./scripts/generate_dashboards.sh http://localhost:9090 pulsar-19990
Setting PULSAR_PROMETHEUS_URL from script input.
PULSAR_PROMETHEUS_URL set to: http://localhost:9090
Setting PULSAR_CLUSTER from script input.
PULSAR_CLUSTER set to: pulsar-19990
Using existing PULSAR_CUSTOM_PROMETHEUS environment variable.
PULSAR_CUSTOM_PROMETHEUS set to:
Using existing GF_LOKI_URL environment variable.
GF_LOKI_URL set to:
Using existing GF_LOKI_DATASOURCE_NAME environment variable.
GF_LOKI_DATASOURCE_NAME set to:
Generating Datasources ...
Traceback (most recent call last):
File "/usr/local/bin/j2", line 10, in
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 206, in main
sys.argv[1:]
File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 186, in render_command
result = renderer.render(args.template, context)
File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 87, in render
.render(context)
File "/usr/local/lib/python2.7/dist-packages/jinja2/environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "/usr/local/lib/python2.7/dist-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/mnt/h/apache-pulsar-grafana-dashboard/target/datasources.yml", line 68, in top-level template code
url: "{{ GF_LOKI_URL }}"
jinja2.exceptions.UndefinedError: 'GF_LOKI_DATASOURCE_NAME' is undefined

[tuteng]

If the Loki module is not enabled, you can use the following configuration, remember to install the j2 module => pip install j2cli

./scripts/generate_dashboards.sh localhost:9090 standalone

GF_LOKI_DATASOURCE_NAME=test
GF_LOKI_URL=xxxx
PULSAR_CUSTOM_PROMETHEUS=http://localhost:9090 or your-prometheus-url