Write log lines to the syslog in a way that the Acquia log streamer will show them.

write-to-acquia-log-stream.sh

#!/usr/bin/env bash
# Write log lines to the syslog in a way that the Acquia log streamer
# will show them.

WATCHDOG_NAME='Logging Example'

# General logging to syslog.
log() {
  (>&2 echo "${1}")
  if [[ ! -z "${AH_SITE_NAME}" ]]; then
    logger -p local0.info -t ${AH_SITE_NAME} -- "${WATCHDOG_NAME} (info): ${1}"
  fi
}
# Log text to STDERR and syslog.
error() {
  (>&2 echo "${1}")
  if [[ ! -z "${AH_SITE_NAME}" ]]; then
    logger -p local0.err -t ${AH_SITE_NAME} -- "${WATCHDOG_NAME} (error): ${1}";
  fi
}
# Log an error message and exit the script.
errorexit() { error "${1}"; exit 1; }

log 'This will show in the log stream as info.'
error 'This will show in the log stream as an error.'
errorexit 'This will show in the log stream as an error.'

This shows under the drupal watchdog stream.