I've also heard good things about Sentry, though if you need to self-host it, then there's a bit of complexity to deal with: https://sentry.io/welcome/
Though of course, Prometheus and Grafana is a rather popular option as well!
Personal opinion: it doesn't seem to have gotten as much love or attention as many other commercial projects, currently being under Apache Foundation and just slowly trudging ahead. Someone else mentioned it being more popular in China which is fair, but also means that the docs and blog posts about it etc. aren't getting as much attention in the west and other places.
Personally, for many of my use cases (typically simpler projects, <20 services per environment), it's good enough, the platform support is mostly there for most of the popular languages: https://skywalking.apache.org/docs/
The docs are also there and configuring it is actually easier than Sentry, because of fewer moving parts: https://skywalking.apache.org/docs/main/next/en/setup/backen...
I don't particularly like using ElasticSearch which seems like the "happy path" but ES just loves to eat memory in general. Thankfully, there are actually some nice options for alternatives here, I wonder why other projects haven't embraced such modularity: https://skywalking.apache.org/docs/main/next/en/setup/backen...
I think that might not quite be the case in the latest versions: https://docs.sentry.io/product/performance/metrics/#custom-p...
In addition to the automatic performance metrics described above, Sentry supports setting custom performance metrics on transactions.
Custom performance metrics allow you to define metrics (beyond the ones mentioned above) that are important to your application and send them to Sentry.
For example, you might want to set a custom metric to track:
- Total memory usage during a transaction
- The amount of time being queried
- Number of times a user performed an action during a transaction
You define and configure custom metrics in the SDK.