OPA

Function	Description	Meta
opa.runtime	output := opa.runtime() Returns an object that describes the runtime environment where OPA is deployed. Returns: output (object[string: any]) includes a config key if OPA was started with a configuration file; an env key containing the environment variables that the OPA process was started with; includes version and commit keys containing the version and build commit of OPA.	SDK-dependent

danger

Policies that depend on the output of opa.runtime may return different answers depending on how OPA was started. If possible, prefer using an explicit input or data value instead of opa.runtime.

Debugging

Built-in	Description	Details
print(...)	print is used to output the values of variables for debugging purposes. print calls have no effect on the result of queries or rules. All variables passed to print must be assigned inside of the query or rule. If any of the print arguments are undefined, their values are represented as <undefined> in the output stream. Because policies can be invoked via different interfaces (e.g., CLI, HTTP API, etc.) the exact output format differs. See the table below for details.	SDK-dependent

API	Output	Memo
opa eval	stderr
opa run (REPL)	stderr
opa test	stdout	Specify -v to see output for passing tests. Output for failing tests is displayed automatically.
opa run -s (server)	stderr	Specify --log-level=info (default) or higher. Output is sent to the log stream. Use --log-format=text for pretty output.
Go (library)	io.Writer	https://pkg.go.dev/github.com/open-policy-agent/opa/rego#example-Rego-Print_statements