td><td>No</td></tr><tr id=PluginConfig-metric_expiry_duration><td><code>metric_expiry_duration</code></td><td><code><a href=https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#duration>Duration</a></code></td><td><p>Optional. Controls the metric expiry duration. If a metric time series is
not updated for the given duration, it will be purged from time series
cache as well as metric reporting. If this is not set or set to 0, time
series will never be expired. This option is useful t