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3rd chunk of `content/manuals/engine/logging/drivers/syslog.md`
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| `syslog-tls-cert`        | The absolute path to the TLS certificate file. Ignored if the address protocol isn't `tcp+tls`.                                                                                                                                                                                                                  | `--log-opt syslog-tls-cert=/etc/ca-certificates/custom/cert.pem`                                         |
| `syslog-tls-key`         | The absolute path to the TLS key file. Ignored if the address protocol isn't `tcp+tls`.                                                                                                                                                                                                                          | `--log-opt syslog-tls-key=/etc/ca-certificates/custom/key.pem`                                           |
| `syslog-tls-skip-verify` | If set to `true`, TLS verification is skipped when connecting to the `syslog` daemon. Defaults to `false`. Ignored if the address protocol isn't `tcp+tls`.                                                                                                                                                      | `--log-opt syslog-tls-skip-verify=true`                                                                  |
| `tag`                    | A string that's appended to the `APP-NAME` in the `syslog` message. By default, Docker uses the first 12 characters of the container ID to tag log messages. Refer to the [log tag option documentation](log_tags.md) for customizing the log tag format.                                                        | `--log-opt tag=mailer`                                                                                   |
| `syslog-format`          | The `syslog` message format to use. If not specified the local Unix syslog format is used, without a specified hostname. Specify `rfc3164` for the RFC-3164 compatible format, `rfc5424` for RFC-5424 compatible format, or `rfc5424micro` for RFC-5424 compatible format with microsecond timestamp resolution. | `--log-opt syslog-format=rfc5424micro`                                                                   |
| `labels`                 | Applies when starting the Docker daemon. A comma-separated list of logging-related labels this daemon accepts. Used for advanced [log tag options](log_tags.md).                                                                                                                                                 | `--log-opt labels=production_status,geo`                                                                 |
| `labels-regex`           | Applies when starting the Docker daemon. Similar to and compatible with `labels`. A regular expression to match logging-related labels. Used for advanced [log tag options](log_tags.md).                                                                                                                        | `--log-opt labels-regex=^(production_status\|geo)`                                                       |
| `env`                    | Applies when starting the Docker daemon. A comma-separated list of logging-related environment variables this daemon accepts. Used for advanced [log tag options](log_tags.md).                                                                                                                                  | `--log-opt env=os,customer`                                                                              |
| `env-regex`              | Applies when starting the Docker daemon. Similar to and compatible with `env`. A regular expression to match logging-related environment variables. Used for advanced [log tag options](log_tags.md).                                                                                                            | `--log-opt env-regex=^(os\|customer)`                                                                    |
Title: Syslog Logging Driver Options (Continued)
Summary
Continuing the list of syslog logging driver options, this section covers `tag` for appending a string to the syslog APP-NAME, `syslog-format` to specify the syslog message format (e.g., RFC3164, RFC5424), `labels` and `labels-regex` to accept logging-related labels, and `env` and `env-regex` to accept logging-related environment variables when starting the Docker daemon. These are used for advanced log tag options.