# Tenzir Node v4.14.0 ## 馃殌 Features ### Implement strides for the `slice` operator May 17, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4216](https://github.com/tenzir/tenzir/pull/4216) The `slice` operator now supports strides in the form of `slice ::`. Negative strides reverse the event order. The new `reverse` operator is a short form of `slice ::-1` and reverses the event order. ### Add statistical aggregation functions May 17, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4208](https://github.com/tenzir/tenzir/pull/4208) The new `mean` aggregation function computes the mean of grouped numeric values. The new `approximate_median` aggregation function computes an approximate median of grouped numeric values using the t-digest algorithm. The new `stddev` and `variance` aggregation functions compute the standard deviation and variance of grouped numeric values, respectively. The new `collect` aggregation function collects a list of all non-null grouped values. Unlike `distinct`, this function does not remove dulicates and the results may appear in any order. ### Add timeout options to `summarize` May 14, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4209](https://github.com/tenzir/tenzir/pull/4209) The `summarize` operator gained two new options: `timeout` and `update-timeout`, which enable streaming aggregations. They specifiy the maximum time a bucket in the operator may exist, tracked from the arrival of the first and last event in the bucket, respectively. The `timeout` is useful to guarantee that events are held back no more than the specified duration, and the `update-timeout` is useful to finish aggregations earlier in cases where events that would be sorted into the same buckets arrive within the specified duration, allowing results to be seen earlier. ## 馃敡 Changes ### Change the syntax of the `slice` operator May 14, 2024 路 [@dominiklohmann](https://github.com/dominiklohmann) 路 [#4211](https://github.com/tenzir/tenzir/pull/4211) The `slice` operator now expects its arguments in the form `:`, where either the begin or the end value may be omitted. For example, `slice 10:` returns all but the first 10 events, `slice 10:20` returns events 10 to 20 (exclusive), and `slice :-10` returns all but the last 10 events. ## 馃悶 Bug Fixes ### Make syslog parser more lenient May 17, 2024 路 [@mavam](https://github.com/mavam) 路 [#4225](https://github.com/tenzir/tenzir/pull/4225) The `syslog` parser incorrectly identified a message without hostname and tag as one with hostname and no tag. This resulted in a hostname with a trailing colon, e.g., `zscaler-nss:`. In such messages, the parser now correctly sets the hostname to `null` and assigns `zscaler-nss` as tag/app, without the trailing colon. ### Remove the superfluous path separators when using S3 or GS connectors May 17, 2024 路 [@Dakostu](https://github.com/Dakostu) 路 [#4222](https://github.com/tenzir/tenzir/pull/4222) Paths for `s3` and `gs` connectors are not broken anymore during loading/saving. [ Download on GitHub ](https://github.com/tenzir/tenzir/releases/tag/v4.14.0) [Get the release artifacts and source code.](https://github.com/tenzir/tenzir/releases/tag/v4.14.0)