Posts in 2025
Efficient Query Parallelism in Cortex with Dynamic Query Splitting
Tuesday, August 12, 2025 in Blog
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Introduction Cortex traditionally relied on static query splitting and static vertical sharding to optimize the execution of long-range PromQL queries. Static query splitting divides a query into fixed time intervals, while vertical sharding—when …
Block the Blast: How Query Rejection Protects Your Cortex Cluster
Monday, August 04, 2025 in Blog
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Introduction We had events where a set of seemingly harmless-looking dashboard queries kept slipping just under our limits yet repeatedly OOM-killing the querier pods. Our safeguard mechanisms weren’t enough, and the only hope was that the tenant …
Optimizing PromQL queries: A deep dive
Tuesday, April 29, 2025 in Blog
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Introduction This guide explains how Cortex evaluates PromQL queries, details how time series data is stored and retrieved, and offers strategies to write performant queries — particularly in high-cardinality environments. Note: If you are new to …
Introducing the Cortex Blog: Sharing Our Journey
Saturday, April 26, 2025 in Blog
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Welcome to the official Cortex blog! We’re kicking things off here to share updates, best practices, technical deep-dives, and community highlights around everything Cortex. Whether you’re operating a Cortex cluster, integrating it into your …