I can replicate your problem here, when creating 1.prom and 2.prom
However, if I concatenate the two files into one, it works; I also note
that the metrics with the same metric name are grouped together under the
same heading (even though they weren't adjacent in the source).
# HELP kafka_topic_cluster_last_update Metric read from /tmp/prom/all.prom
# TYPE kafka_topic_cluster_last_update untyped
kafka_topic_cluster_last_update{cluster="dev",ts="1582844402760"}
1.58284440276e+12
kafka_topic_cluster_last_update{cluster="test",ts="1582844402760"}
1.58284440276e+12
# HELP kafka_topic_details Metric read from /tmp/prom/all.prom
# TYPE kafka_topic_details untyped
kafka_topic_details{atopic="APPC-LCM-READ-REGRESSION-1848",bpartition="0",cleader="2",cluster="dev",dreplicas="2,3,1",eisr="1,2,3",ts="1582844402760"}
3
kafka_topic_details{atopic="APPC-LCM-READ-REGRESSION-1848",bpartition="0",cleader="2",cluster="test",dreplicas="2,3,1",eisr="1,2,3",ts="1582844402760"}
3
# HELP kafka_topic_partitioncount Metric read from /tmp/prom/all.prom
# TYPE kafka_topic_partitioncount untyped
kafka_topic_partitioncount{atopic="APPC-LCM-READ-REGRESSION-1848",cluster="dev"}
8
kafka_topic_partitioncount{atopic="APPC-LCM-READ-REGRESSION-1848",cluster="test"}
8
# HELP kafka_topic_rf Metric read from /tmp/prom/all.prom
# TYPE kafka_topic_rf untyped
kafka_topic_rf{atopic="APPC-LCM-READ-REGRESSION-1848",cluster="dev"} 3
kafka_topic_rf{atopic="APPC-LCM-READ-REGRESSION-1848",cluster="test"} 3
I can only hypothesise that this grouping only works when all the metrics
with a given metric name are in the same file, and that textfile collector
doesn't support using the same metric name in two different files. But I
couldn't find such a limitation documented anywhere.
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