telegraf.service remove curly brackets on $TELEGRAF_OPTS #3354
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With the brackets you cannot add more than 1 flag to the ExecStart command. Flags that require arguments will not work.
The following addition to /etc/default/telegraf gives a "flag provided but not defined" ERROR and the service fails to start. Removing the brackets from $TELEGRAF_OPTS fixes this.
#/etc/default/telegraf
TELEGRAF_OPTS=-pidfile /var/run/telegraf/telegraf.pid
log: flag provided but not defined: -pidfile /var/run/telegraf/telegraf.pid
https://www.freedesktop.org/software/systemd/man/systemd.service.html
"Use "${FOO}" as part of a word, or as a word of its own, on the command line, in which case it will be replaced by the value of the environment variable including all whitespace it contains, resulting in a single argument. Use "$FOO" as a separate word on the command line, in which case it will be replaced by the value of the environment variable split at whitespace, resulting in zero or more arguments. "