hanahmily opened a new issue #5341:
URL: https://github.com/apache/skywalking/issues/5341
We need groovy expression to analyze the below metrics. Since spring meter
has implemented it, we should use a uniform expression to fix it.
```
sum(rate(pilot_xds_write_timeout{cluster_name="cluster"}[1m])) +
sum(rate(pilot_total_xds_internal_errors{cluster_name="cluster"}[1m])) +
sum(rate(pilot_total_xds_rejects{cluster_name="cluster"}[1m])) +
sum(rate(pilot_xds_expired_nonce{cluster_name="cluster"}[1m])) +
sum(rate(pilot_xds_push_context_errors{cluster_name="cluster"}[1m])) +
sum(rate(pilot_xds_pushes{cluster_name="cluster", type=~".*_senderr"}[1m]))
```
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