Given recent economic changes, cost efficiency has become a top priority for many businesses. This is especially important for monitoring because the nature of telemetry data tends to exponential growth. Many monitoring solutions are now switching their focus to optimize costs. The talk will cover open-source instruments from VictoriaMetrics ecosystem for improving monitoring cost-efficiency. Compression optimization. While ZSTD compression and time series specific techniques like delta-encoding are great, there is still room for improvement. I’ll explain what else can be done to reduce disk footprint for long-term storage. Extra compression on data transferring between metrics collectors and TSDB. I’ll explain how VictoriaMetrics collector reduces the traffic volume by 4 times. Pre-computing for telemetry data on collectors, frequently referred to as edge computing. In VictoriaMetrics it is named as streaming aggregation and allows collectors to pre-compute data, reducing its resolution and cardinality before it is pushed to the database. This is especially important for Prometheus-like systems because streaming aggregation is compatible with Prometheus RemoteWrite protocol and can be used with any system which supports it. Cardinality explorer. Interface, which provides useful insights into data stored by the TSDB. It helps to identify the most expensive metrics or labels and see how they have changed in time. Query tracing. This feature provides details about all the stages of query execution, including time spent on index lookups, disk reads, data transfer, computation, and memory expenses. This is similar to SQL EXPLAIN feature, and helps to improve the performance of read queries. Compute efficiency. VictoriaMetrics components for collecting and storing telemetry data consume fewer resources compared to components from Prometheus ecosystem. It may sound like competition or bragging, but this is a real reason why people migrate from Prometheus to VictoriaMetrics – to cut their infrastructure costs by 2-3 times. All the features listed above are open-source and are available for everyone to use. The talk will be mostly concentrated on typical use cases in monitoring and elegant ways to make things more efficient.