The certbot plugins command can be used to list the plugins certbot has loaded.

~]$ certbot plugins

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* dns-godaddy
Description: Obtain certificates using a DNS TXT record (if you are using
godaddy for DNS).
Interfaces: Authenticator, Plugin
Entry point: dns-godaddy = certbot_dns_godaddy:Authenticator

* dns-route53
Description: Obtain certificates using a DNS TXT record (if you are using AWS
Route53 for DNS).
Interfaces: Authenticator, Plugin
Entry point: dns-route53 =
certbot_dns_route53._internal.dns_route53:Authenticator

* standalone
Description: Runs an HTTP server locally which serves the necessary validation
files under the /.well-known/acme-challenge/ request path. Suitable if there is
no HTTP server already running. HTTP challenge only (wildcards not supported).
Interfaces: Authenticator, Plugin
Entry point: standalone = certbot._internal.plugins.standalone:Authenticator

* webroot
Description: Saves the necessary validation files to a
.well-known/acme-challenge/ directory within the nominated webroot path. A
seperate HTTP server must be running and serving files from the webroot path.
HTTP challenge only (wildcards not supported).
Interfaces: Authenticator, Plugin
Entry point: webroot = certbot._internal.plugins.webroot:Authenticator
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