Marco Pracucci

Instant query time splitting loses counter increases between time splitting boundaries

1

## Example For example, let's consider a counter series with the following samples: - T: `0` V: `1` - T: `29` V: `2` - T: `59` V: `3` - T:...

Instant query time splitting can cause different query results using rate/delta/increase on stale metrics

3

While developing instant query time splitting we found that it can cause different query results (compared to a query running without splitting) when using `rate()` / `increase()` / `delta()` and...

We have some documentation for Ruler's `local` backend storage support ([see here](https://grafana.com/docs/mimir/next/operators-guide/architecture/components/ruler/#local-storage)), but we have no such documentation for Alertmanager which also supports the `local` backend storage. We should add...

At Grafana Labs we override Mimir jsonnet to inject objest storage credentials. We should upstream such support, to ease the configuration for OSS users too.

Track reason why a query result is not cached

1

We should add a metric to track the reason why a query results is not cached, and ensure we have another metric with the total number of queries for which...

High memory usage even if no event is processed by the output plugin

2

Today I've introduced the `s3` output to our pipeline and I've noticed the plugin (and its dependencies) increases the `logstash` memory usage by ~100mb. The following screenshot shows the difference...

Blocks storage unable to ingest samples older than 1h after an outage

54

TSDB doesn't allow to append samples whose timestamp is older than the last block cut from the head. Given a block is cut from the head up until -50% of...

Distributors OOM on a single slow ingester in the cluster

12

Yesterday we've got all distributors continuously `OOMKilled` in one of our Cortex clusters. The root cause analysis outlined this issue has been caused by a single ingester which was running...

Ingesters latency and in-flight requests spike right after startup with empty TSDB

2

**Describe the bug** When starting a brand new ingester (empty disk - running blocks storage), as soon as the ingester is registered to the ring and its state switches to...

Store-gateway: high memory allocations caused by per-tenant Prometheus registry

1

**Describe the bug** To be able to use Thanos BucketStore while supporting Cortex multi-tenancy we need to create a BucketStore for each tenant, passing a dedicated Prometheus registry to each...