There is a lot of overlap between logging, monitoring and crash/error reporting. In Sentry with some systems it does hook up to your logging framework to gather extra context through breadcrumbs or adds a hook to send logged error reports (in addition to the error reports from exceptions and crashes). They also follow logging good practices and integrate with them, but if you need logging, you can't use sentry for that. It only keeps the relevant information to a specific crash, and it aggregates data from crashes of a specific type so you won't even get historical data from crashes in some instances. Quoting from one of their blogs:
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Sentry is built on top of best practices like logging. However, this can cause confusion and signal-to-noise issues if you don’t understand the the difference between logging and error reporting.
Throughout your application you are likely logging many kinds of events. While these are commonly errors, you are probably logging a lot of debug information as well. This is the fundamental reason why logging has levels (e.g., debug, warning, error). When we abstract our crash reporting through logs, the challenge is to differentiate between actual errors and debug noise.
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https://blog.sentry.io/2016/02/09/what-is-crash-reporting
