removed to similar notes saying the same thing

updated SLA data Persistence section to document our behavior
mention empty data file to disable Persistence
trim empty spaces from lines

README.md

@@ -37,9 +37,10 @@ EaseProbe would do three kinds of work - **Probe**, **Notify**, and **Report**.
 
 Ease Probe supports the following probing methods: **HTTP**, **TCP**, **Shell Command**, **SSH Command**, **Host Resource Usage**, and **Native Client**.
 
-> **Notes**:
+
+> **Note**:
 >
-> The prober name is a unique ID, DO NOT use the same name for a different prober.
+> **Keep in mind that the prober name must be **unique** among probes. If multiple probes are defined with the same name, it could lead to corruption of the metrics data and the behavior of the application will be non-deterministic.**
 
 - **HTTP**. Checking the HTTP status code, Support mTLS, HTTP Basic Auth, and can set the Request Header/Body. ( [HTTP Probe Configuration](#31-http-probe-configuration) )
 
@@ -183,7 +184,7 @@ notify:
  sms:
  - name: "sms alert service"
  provider: "yunpian"
- key: xxxxxxxxxxxx # yunpian apikey 
+ key: xxxxxxxxxxxx # yunpian apikey
  mobile: 123456789,987654321 # mobile phone number, multiple phone number joint by `,`
  sign: "xxxxxxxx" # need to register; usually brand name
 ```
@@ -216,13 +217,9 @@ Check the [Notification Configuration](#37-notification-configuration) to see h
 
 - **SLA Data Persistence**. Save the SLA statistics data on the disk.
 
- The SLA data would be persisted in `$CWD/data/data.yaml` by default. If you want to configure the path, you can do it in the `settings` section.
-
- Whenever EaseProbe starts, load the data if found, and remove the probers that are not in configuration if the configuration changes.
+ The SLA data would be persisted in `$CWD/data.yaml` by default. If you want to configure the path, you can do it in the `settings` section.
 
- > **Note**:
- >
- > **The prober's name is a unique ID, so if multiple probes with the same name, the data would conflict, and the behavior is unknown.**
+ When EaseProbe starts, it loads the data found in `data.yaml` (if found) and removes any probers that are no longer present in the configuration file. Setting a an empty `data:` disables SLA persistence (eg `data: ""`).
 
  ```YAML
  settings:
@@ -248,7 +245,7 @@ There are some administration configuration options:
  pid: /var/run/easeprobe.pid
  ```
 
- - If the file already exists, EaseProbe would overwrite it. 
+ - If the file already exists, EaseProbe would overwrite it.
  - If the file cannot be written, EaseProbe would exit with an error.
 
  If you want to disable the PID file, you can configure the pid file to "".
@@ -260,7 +257,7 @@ There are some administration configuration options:
 
 **2) Log file Rotation**
 
- There are two types of log file: **Application Log** and **HTTP Access Log**. 
+ There are two types of log file: **Application Log** and **HTTP Access Log**.
 
  Both Application Log and HTTP Access Log would be StdOut by default. They all can be configured by:
 
@@ -270,7 +267,7 @@ There are some administration configuration options:
  self_rotate: true # default: true
  ```
 
- If `self_rotate` is `true`, EaseProbe would rotate the log automatically, and the following options are available: 
+ If `self_rotate` is `true`, EaseProbe would rotate the log automatically, and the following options are available:
 
  ```YAML
  size: 10 # max size of log file. default: 10M
@@ -282,7 +279,7 @@ There are some administration configuration options:
  If `self_rotate` is `false`, EaseProbe will not rotate the log, and the log file will have to be rotated by a 3rd-party tool (such as `logrotate`) or manually by the administrator.
 
  ```shell
- mv /path/to/easeprobe.log /path/to/easeprobe.log.0 
+ mv /path/to/easeprobe.log /path/to/easeprobe.log.0
  kill -HUP `cat /path/to/easeprobe.pid`
  ```
 
@@ -658,7 +655,7 @@ notify:
  sms:
  - name: "sms alert service - yunpian"
  provider: "yunpian"
- key: xxxxxxxxxxxx # yunpian apikey 
+ key: xxxxxxxxxxxx # yunpian apikey
  mobile: 123456789,987654321 # mobile phone number, multi phone number joint by `,`
  sign: "xxxxx" # get this from yunpian
 
@@ -687,16 +684,16 @@ settings:
 
  # Daemon settings
 
- # pid file path, default: $CWD/easeprobe.pid, 
+ # pid file path, default: $CWD/easeprobe.pid,
  # if set to "", will not create pid file.
- pid: /var/run/easeprobe.pid 
+ pid: /var/run/easeprobe.pid
 
  # A HTTP Server configuration
  http:
  ip: 127.0.0.1 # the IP address of the server. default:"0.0.0.0"
  port: 8181 # the port of the server. default: 8181
  refresh: 5s # the auto-refresh interval of the server. default: the minimum value of the probes' interval.
- log: 
+ log:
  file: /path/to/access.log # access log file. default: Stdout
  # Log Rotate Configuration (optional)
  self_rotate: true # true: self rotate log file. default: true
@@ -720,6 +717,8 @@ settings:
  # SLA data persistence file path.
  # The default location is `$CWD/data/data.yaml`
  data: /path/to/data/file.yaml
+ # Use the following to disable SLA data persistence
+ # data: ""
  backups: 5 # max of SLA data file backups. default: 5
  # if set to a negative value, keep all backup files