if objAPI == nil {
		return errServerNotInitialized
	}

	var errs []error
	setDriveCounts := objAPI.SetDriveCounts()
	switch subSys {
	case config.APISubSys:
		apiConfig, err := api.LookupConfig(s[config.APISubSys][config.Default])
		if err != nil {
			configLogIf(ctx, fmt.Errorf("Invalid api configuration: %w", err))
		}

	serverVersion, err := c.GetKubernetesVersion()
	if err != nil {
		return fmt.Errorf("error getting Kubernetes version: %w", err)
	}
	if !kube.IsAtLeastVersion(c, MinK8SVersion) {
		l.LogAndPrintf(UnSupportedK8SVersionLogMsg, serverVersion.GitVersion, pkgVersion.Info.Version, MinK8SVersion)
	}
	return nil

pkg database/sql, method (*Conn) BeginTx(context.Context, *TxOptions) (*Tx, error)
pkg database/sql, method (*Conn) Close() error
pkg database/sql, method (*Conn) ExecContext(context.Context, string, ...interface{}) (Result, error)
pkg database/sql, method (*Conn) PingContext(context.Context) error
pkg database/sql, method (*Conn) PrepareContext(context.Context, string) (*Stmt, error)

// initializeProvider initializes if any additional vendor specific information
// was provided, initialization will return an error initial login fails.
func (p *providerCfg) initializeProvider(cfgGet func(string) string, transport http.RoundTripper) error {
	vendor := cfgGet(Vendor)
	if vendor == "" {
		return nil
	}
	var err error
	switch vendor {
	case keyCloakVendor:
		adminURL := cfgGet(KeyCloakAdminURL)
		realm := cfgGet(KeyCloakRealm)

	if err != nil {
		return tls.Certificate{}, ErrTLSUnexpectedData(nil).Msg(err.Error())
	}
	return cert, nil
}

// EnsureCertAndKey checks if both client certificate and key paths are provided
func EnsureCertAndKey(clientCert, clientKey string) error {
	if (clientCert != "" && clientKey == "") ||
		(clientCert == "" && clientKey != "") {
		return errors.New("cert and key must be specified as a pair")
	}
	return nil

     * @param repository The repository that caused the error, may be {@code null}.
     */
    public InvalidRepositoryException(String message, Repository repository) {
        super(message);
        this.repository = repository;
    }

    /**
     * Gets the repository that causes this error (if any).
     *
     * @return The repository that causes this error or {@code null} if not known.
     */

// sysexits to signify some error running istioctl, and use 79-125 as custom
// error codes for other info that we'd like to use to pass info on.
const (
	ExitUnknownError   = 1 // for compatibility with existing exit code
	ExitIncorrectUsage = 64
	ExitDataError      = 65 // some format error with input data

	// below here are non-zero exit codes that don't indicate an error with istioctl itself

                    case UNSPECIFIED:
                        result += "Unspecified error";
                        break;
                    default:
                        result += "Unknown error code: " + errorCode;
                }
                break;
            default:
                result += "unknown error class: " + errorClass;
        }
        return result;
    }

			ExpectedOutput: "Error: no pods found with selector app.kubernetes.io/name=grafana\n",
			WantException:  true,
		},
		{ // case 7
			Args:           strings.Split("jaeger --browser=false", " "),
			ExpectedOutput: "Error: no pods found with selector app=jaeger\n",
			WantException:  true,
		},
		{ // case 8
			Args:           strings.Split("kiali --browser=false", " "),

To signify the end of the stream, close the ring buffer from the writer side with `rb.CloseWriter()`

Either side can use `rb.CloseWithError(err error)` to signal an error and close the ring buffer. 
Any reads or writes will return the error on next call.