How you can control the size of the rendered images

when sending alerts by mail, images are rendered with constant width and height parameters. how can these values be changed globally or individually?

t=2020-09-16T17:11:02+0000 lvl=dbug msg="calling remote rendering service" logger=rendering renderer=http url="http://grafana-custom-render:8081/render?deviceScaleFactor=1.000000&domain=grafana-custom&encoding=&height=500&renderKey=****&timeout=15&timezone=&url=http%3A%2F%2Fgrafana-custom%3A80%2Fd-solo%2F1ysPSM3Wz%2Ftiumgu-uvedomleniia-ob-oshibkakh-vygruzki%3ForgId%3D1%26panelId%3D37%26render%3D1&width=1000"

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grafana 7.1.5
render image: grafana/grafana-image-renderer:2.0.0