Scout APM is good especially if you're using Rails or Python. Everything is included in the free tier.
Ask HN: Cheaper Datadog anyone?
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Re: Ask HN: Cheaper Datadog anyone?
#12Signoz (invested by YC) is the cheaper alternative. They use OpenTelemetry and seems to work for basic scenarios well.
Of course, it doesn't have the 293428492 features that Datadog has, but works well enough for the main APM use-case