# Expected timestamp or new record, got MNAME

**URL:** <https://discuss.prometheus.io/t/expected-timestamp-or-new-record-got-mname/684>\
**Category:** Prometheus server\
**Created:** [January 4, 2022, 9:31pm UTC](https://discuss.prometheus.io/t/expected-timestamp-or-new-record-got-mname/684 "2022-01-04T21:31:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![haf](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.prometheus.io/haf/32/313_2.png) [@haf](https://discuss.prometheus.io/u/haf)\
**Post date:** [January 4, 2022, 9:31pm UTC](https://discuss.prometheus.io/t/expected-timestamp-or-new-record-got-mname/684/1 "2022-01-04T21:31:40Z")

</div>

Hi,

I’m trying to debug an error with app exported Prom metrics; getting:

> prom-prometheus-server-6979dc7bb-t9jm9 prometheus-server ts=2022-01-04T21:28:20.943Z caller=scrape.go:1307 level=debug component=“scrape manager” scrape\_pool=kubernetes-pods target=[http://10.4.1.20:15020/stats/prometheus](http://10.4.1.20:15020/stats/prometheus) msg=“Append failed” err=“expected timestamp or new record, got "MNAME"”

I can’t visually see what line this is on from reading the same endpoint that is failing.

Doing a

> curl --silent localhost:15020/stats/prometheus | promtool check metrics

Yields no extra information either besides naming suffix suggestions.

How can I find 1) what line is causing this and what its contents are?, 2) how to fix it?

(I’m using the vanilla `prometheus_client` exporter, with three simple counters and one Gauge, as well as Istio’s merged metrics.)