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oauth2-proxy
A reverse proxy that provides authentication with Google, Azure, OpenID Connect and many more identity providers.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The other option is using a proxy in front of your service to do that oauth check for the application. The application has no knowledge of this, the proxy is essentially acting as a firewall (or a WAF). oauth2-proxy can do this for you, in conjunction with a service like keycloak.
First is SSO (well, more importantly web SSO so we don't get confused with kerberos). Some services can use a dedicated authentication service like keycloak and talk to it over SAML or OIDC protocols. There is also a less generic OAUTH2 protocol that requires a per-provider configuration. Either way your application has to support and be configured to use these options.