Inconsistent indentation in node_exporter systemd unit ExecStart line #886

When rendering the node_exporter systemd service unit from the Jinja2 template, collector arguments receive inconsistent leading whitespace.

Example of rendered output:

ExecStart=/usr/local/bin/node_exporter \
    '--collector.systemd' \
'--collector.textfile' \
    '--collector.textfile.directory=/var/lib/node_exporter' \
'--collector.filesystem' \
    '--collector.filesystem.ignored-fs-types=^(sys|proc|auto)fs$' \
    '--collector.filesystem.ignored-mount-points=^/(sys|proc|dev)($|/)' \
    '--web.listen-address=0.0.0.0:9100' \
    '--web.telemetry-path=/metrics'

The line for mapping-style collectors (textfile, filesystem) lose their indentation, while simple string collectors are correctly indented.

Root cause:

Whitespace control (-%}) combined with the different code paths for string vs. mapping collectors in the Jinja2 template produces uneven leading spaces.

Variables that trigger the issue:

node_exporter_enabled_collectors:
  - systemd
  - textfile:
      directory: "{{ node_exporter_textfile_dir }}"
  - filesystem:
      ignored-mount-points: "^/(sys|proc|dev)($|/)"
      ignored-fs-types: "^(sys|proc|auto)fs$"

node_exporter_disabled_collectors: []