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Training our own AI models - PostHog From 270GB RAM to 5GB: Moving local flag evaluation from Django to Rust The best analytics stack for vibe-coded apps The do's and don'ts of minimum viable product marketing - PostHog The best MCP servers for startups, by workflow 4,063 errors closed without a human opening PostHog – here's what we learned - PostHog PostHog Code and the self-driving product - PostHog Why attacking your competitors online is dumb - PostHog The best real-time analytics platforms for developers, compared DuckDB vs ClickHouse: Why we use both at PostHog - PostHog PostHog's next chapter - PostHog Making Claude Cowork actually useful - PostHog PostHog vs Matomo in-depth tool comparison You're doing lifecycle emails wrong Untangling Tokio and Rayon in production: From 2s latency spikes to 94ms flat The best HIPAA-compliant A/B testing tools - PostHog A beginner's guide to testing AI agents - PostHog I hate the standup bot (so I built an agent to do it for me) - PostHog The best CDPs for developers, compared The best error tracking tools for developers, compared The best feature flag software for developers, compared 7 best session replay tools for mobile apps 7 best free open source business intelligence tools right now 7 best free and open source LLM observability tools PostHog vs LogRocket in-depth tool comparison The most popular PostHog alternatives, compared Open source (and self-hosted) session replay tools - PostHog The 9 best GA4 alternatives for apps and websites - PostHog PostHog vs Google Analytics 4 in-depth tool comparison How we built automatic clustering for LLM traces - PostHog The 7 best HIPAA-compliant analytics tools 8 best open source analytics tools you can self-host - PostHog The best product analytics tools for startups, compared PostHog vs FullStory in-depth tool comparison The best in-app survey tools for product teams, compared The 7 best mobile app analytics tools PostHog vs Hotjar in-depth tool comparison The 8 best free and open-source feature flag services - PostHog The 5 best free and open-source A/B testing tools - PostHog The best mobile app A/B testing tools, compared What is a feature flag? 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Array 1.38.0: Exports, subscriptions and session analysis - PostHog
2022-08-01 · via PostHog's RSS Feed

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Running a self-hosted instance? Check out our Upgrading PostHog guide.

PostHog 1.38.0 release notes

Release highlights:

New: Subscriptions & exports for dashboards and insights

We've added multiple ways to get insights and dashboards out of PostHog and into your other daily tools, such as Slack. You can now:

  • Export dashboards or insights as an image, to share anywhere you need
  • Setup email subscriptions to have updates sent to you and your team regularly
  • Setup Slack subscriptions to get scheduled updates into any channel you choose

We've already found subscriptions to be incredibly useful for our team, so go ahead and get started!

New: Session analysis returns

Session Analysis

After previously deprecating the Sessions page, we've now bought sessions back in a new and improved form. As of 1.38.0, we've added support for tracking and analyzing sessions within the insights feature.

This will enable you to get answers to questions such as:

  • What's the average number of sessions/user/day?
  • How many users visit a page and have a session length greater than 30 seconds?
  • What's the distribution of session lengths for users who perform an event?
  • How many unique sessions happen per day where a specific event is performed?

To learn more about session analysis, check out the sessions documentation.

Note: Sessions are currently only supported in posthog-js.

New: Async migration 0005

There is a new async migration available which changes the persons table in ClickHouse to use version instead of _timestamp for collapsing entries. This helps avoid various data integrity issues due to race conditions and batching of Kafka messages within the plugin-server.

Curious about async migrations? Find out more in the self-host docs, or examine this new migration specficially on GitHub.

New: Feature flag persistence across authentication steps

Want to ensure users get a consistent experience across login steps? 1.38.0 improves feature flag persistence for such cases, which is great for experiments where you want the same user to be shown the same variant, no matter how their userID changes. Find out more in the feature flag persistence docs.

Note: This is currently only supported in posthog-js.

New: Breakdown bins

Breakdown Bins

Now, when using the trends breakdown feature, if the property that you're breaking down by is a numerical value, it will be binned into a group.

For example, if you breakdown by a price property, instead of seeing the counts of discrete values like 10.99, 11.00, 12.50, you'll now see the counts of binned values, such as 10.00-13.00,13.01-15.00.

Prefer it the old way? Using the menu on the breakdown table, you can adjust the number of bins used or simply revert to using the discrete values.

Session Analysis

Universal search got a massive upgrade in this update and now enables you to search for specific users with ease. This is especially useful if you want to find specific organizations or users quickly, such as if you're looking for more context on a bug report.

Universal search wasn't the only search-based update this time, either. We also made searching on the Persons page much faster and more reliable than it was before.

Improved: Funnel breakdown attribution

You can now choose which specific funnel step a breakdown property should come from, and whether the same value should be copied over to other funnel steps for analysis. This is very handy for getting even more value from funnels, and further information is included in the funnel documentation.

Improved: Library support for multivariate feature flags and experiments

Our Node, Ruby, Go, and PHP libraries have been updated to support experiments! We are also trialling support for feature flags, groups, and session analytics in our mobile libraries. Interested in giving it a go? Let us know

New: Four new apps released

The community has been busy building many new apps for the PostHog App Store and we're excited to announce the following apps have been released for users on PostHog Cloud...

Interested in building your own app? Here's how to get started!

Improved: Optimized ClickHouse space and speeding up queries

The properties column takes up most of the space in any PostHog ClickHouse setup. This release changes out the default compression scheme for ZSTD(3), reducing space by around 2.4x and speeding up uncached queries by up to 2.4x.

After running this migration only new data will use the updated compression scheme. To get the full benefit of compression on existing data, run OPTIMIZE TABLE sharded_events FINAL on your clickhouse cluster which will rewrite existing data.

Other improvements & fixes

Version 1.38 also adds hundreds of other improvements and fixes, including...

  • Fixed: Update to posthog-js and Hubspot app making sure we don't override initial_referrer and initial_referring_domain. If you ever saw these change and not reflect the true initial values update your posthog-js version (& Hubspot app on self-hosted) to make sure we don't override them in the future.
  • Improvement: Toolbar won't show up automatically anymore, but you can still launch it from the app. This made calls to feature flags faster too :)
  • Improvement: We now automatically comment all SQL queries generated by PostHog with tags. This helps track down performance issues on self-hosted instances.
  • Breaking change: onAction plugin server function is removed. Improving the efficiency of the plugin-server.
  • Improvement: CSV and Image exports now use Object Storage when it is enabled

View the commit log in GitHub for a full history of changes: release-1.37.0...release-1.38.0.

We'd love to hear anything you have to say about PostHog, good or bad. As a thank you, we'll share some awesome PostHog merch.

Want to get involved? Email us to schedule a 30 minute call with one of our teams to help us make PostHog even better!

We always welcome contributions from our community and this time we want to thank the following people...

Do you want to get involved in making PostHog better? Check out our contributing resources to get started, or head to our community page. We also have a list of Good First Issues for ideas on where you can contribute!

Open roles at PostHog

Want to join us in helping make more products successful? We're currently hiring for remote candidates in any of the following roles:

Curious about what it's like to work at PostHog? Check out our careers page for more info about our all-remote team and transparent culture. Don’t see a specific role listed? That doesn't mean we won't have a spot for you. Send us a speculative application!


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(Sorry for the shameless CTA.)