Specify that the ppid should not be set manually.

extension/opampextension/README.md

@@ -32,7 +32,7 @@ The following settings are optional:
  - `reports_effective_config`: Whether to enable the OpAMP ReportsEffectiveConfig capability. Default is `true`.
 - `agent_description`: Setting that modifies the agent description reported to the OpAMP server.
  - `non_identifying_attributes`: A map of key value pairs that will be added to the [non-identifying attributes](https://github.com/open-telemetry/opamp-spec/blob/main/specification.md#agentdescriptionnon_identifying_attributes) reported to the OpAMP server. If an attribute collides with the default non-identifying attributes that are automatically added, the ones specified here take precedence.
-- `ppid`: An optional process ID to monitor. When this process is no longer running, the extension will emit a fatal error, causing the collector to exit.
+- `ppid`: An optional process ID to monitor. When this process is no longer running, the extension will emit a fatal error, causing the collector to exit. This is meant to be set by the Supervisor or some other parent process, and should not be configured manually.
 - `ppid_poll_interval`: The poll interval between check for whether `ppid` is still alive or not. Defaults to 5 seconds.
 
 ### Example