# Tenzir Node v4.20.0 ## 馃殌 Features ### Implement the `cache` operator Aug 30, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4515](https://github.com/tenzir/tenzir/pull/4515) The `cache` operator is a transformation that passes through events, creating an in-memory cache of events on the first use. On subsequent uses, the operator signals upstream operators no to start at all, and returns the cached events immediately. The operator may also be used as a source for reading from a cache only, or as a sink for writing to a cache only. The `/pipeline/launch` operator features four new parameters `cache_id`, `cache_capacity`,`cache_ttl`, and `cache_max_ttl`. If a `cache_id` is specified, the pipeline鈥檚 implicit sink will use the `cache` operator under the hood. At least one of `serve_id` and `cache_id` must be specified. ### Perform individual catalog lookups in `lookup` Aug 30, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4535](https://github.com/tenzir/tenzir/pull/4535) The `lookup` operator is now smarter about retroactive lookups for frequently updated contexts and avoids loading data from disk multiple times for context updates that arrive shortly after one another. ### Implement unstoppable pipelines Aug 22, 2024 路 [@Dakostu](https://github.com/Dakostu) 路 [#4513](https://github.com/tenzir/tenzir/pull/4513) The new `unstoppable` flag allows for pipelines to run and repeat indefinitely without the ability to stop or pause. ### Remove the legacy metrics system Aug 21, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4381](https://github.com/tenzir/tenzir/pull/4381) The new `rebuild` metrics contain information about running partition rebuilds. The `ingest` metrics contain information about all ingested events and their schema. This is slightly different from the existing `import` metrics, which track only events imported via the `import` operator, and are separate per pipeline. ## 馃敡 Changes ### Remove special character escaping from `lines_printer` Aug 26, 2024 路 [@raxyte](https://github.com/raxyte) 路 [#4520](https://github.com/tenzir/tenzir/pull/4520) The `lines` printer now does not perform any escaping and is no longer an alias to the `ssv` printer. Additionally, nulls are skipped, instead of being printed as `-`. ### Remove the legacy metrics system Aug 21, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4381](https://github.com/tenzir/tenzir/pull/4381) The previously deprecated legacy metrics system configured via the `tenzir.metrics` configuration section no longer exists. Use the `metrics` operator instead. `lookup` metrics no longer contain the `snapshot` field; instead, the values show in the `retro` field. ### PRs 4455-4549 Aug 15, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4455](https://github.com/tenzir/tenzir/pull/4455) The `show` operator is deprecated. Use the operator `` instead of `show `. The information from `show dependencies` and `show build` is now available in the `version` operator. ## 馃悶 Bug Fixes ### Perform individual catalog lookups in `lookup` Aug 30, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4535](https://github.com/tenzir/tenzir/pull/4535) We fixed a bug that sometimes caused the `retro.queued_events` value in `lookup` metrics to stop going down again. ### Fix crash for heterogeneous subnet lookup tables Aug 26, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4531](https://github.com/tenzir/tenzir/pull/4531) `context inspect ` no longer crashes for lookup table contexts with values of multiple schemas when using subnets as keys. ### Fix a crash when starting `export` on shutdown Aug 26, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4530](https://github.com/tenzir/tenzir/pull/4530) We fixed an issue where the `export`, `metrics`, or `diagnostics` operators crashed the node when started while the node was shutting down or after an unexpected filesystem error occurred. This happened frequently while using the Tenzir Platform, which subscribes to metrics and diagnostics automatically. ### Fix data parser precedence Aug 22, 2024 路 [@jachris](https://github.com/jachris) 路 [#4523](https://github.com/tenzir/tenzir/pull/4523) IPv6 addresses with a prefix that is a valid duration, for example `2dff::` with the prefix `2d`, now correctly parse as an IP instead of a string. ### Fix regression in `azure-log-analytics` Aug 19, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4516](https://github.com/tenzir/tenzir/pull/4516) We fixed a regression introduced in Tenzir v4.19.2 in the `azure-log-analytics` operator that prevented it from starting correctly. [ Download on GitHub ](https://github.com/tenzir/tenzir/releases/tag/v4.20.0) [Get the release artifacts and source code.](https://github.com/tenzir/tenzir/releases/tag/v4.20.0)