Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

internal/errors.go

@@ -0,0 +1,63 @@
+package internal
+
+import "errors"
+
+var (
+	ErrNotConnected     = errors.New("not connected")
+	ErrSerialization    = errors.New("serialization of metric(s) failed")
+	ErrSizeLimitReached = errors.New("size limit reached")
+)
+
+// StartupError indicates an error that occurred during startup of a plugin
+// e.g. due to connectivity issues or resources being not yet available.
+// In case the 'Retry' flag is set, the startup of the plugin might be retried
+// depending on the configured startup-error-behavior. The 'RemovePlugin'
+// flag denotes if the agent should remove the plugin from further processing.
+type StartupError struct {
+	Err     error
+	Retry   bool
+	Partial bool
+}
+
+func (e *StartupError) Error() string {
+	return e.Err.Error()
+}
+
+func (e *StartupError) Unwrap() error {
+	return e.Err
+}
+
+// FatalError indicates a not-recoverable error in the plugin. The corresponding
+// plugin should be remove by the agent stopping any further processing for that
+// plugin instance.
+type FatalError struct {
+	Err error
+}
+
+func (e *FatalError) Error() string {
+	return e.Err.Error()
+}
+
+func (e *FatalError) Unwrap() error {
+	return e.Err
+}
+
+// PartialWriteError indicate that only a subset of the metrics were written
+// successfully (i.e. accepted). The rejected metrics should be removed from
+// the buffer without being successfully written. Please note: the metrics
+// are specified as indices into the batch to be able to reference tracking
+// metrics correctly.
+type PartialWriteError struct {
+	Err                 error
+	MetricsAccept       []int
+	MetricsReject       []int
+	MetricsRejectErrors []error
+}
+
+func (e *PartialWriteError) Error() string {
+	return e.Err.Error()
+}
+
+func (e *PartialWriteError) Unwrap() error {
+	return e.Err
+}