PSA: There's an incredible XP and Medal farm in Helldivers 2 right now—all you've got to do is mortar some robots

pcgamer.com:

Looking for a quick way to level up your Helldivers 2 character and farm some Medals for your Warbond? Though we've vanquished the bugs and the construction of a containment area is underway, there's now a new problem for Super Earth—murderous armies of Automatons are invading the fringe colonies, looking to kill all humans. Just another day for a Helldiver.

The new Automaton defence missions come in three different flavours; Retrieve Essential Personnel, Launch ICBM, and the one we're going to talk about here, Eradicate Automaton Forces. This mission type is very similar to the Eradicate Terminid Swarm mission; it takes place in a small area, and the only objective required to complete it is killing enemies, namely Automatons.

It does have a couple of key differences, though:

The Mortar Sentry in-particular is an absurdly good Stratagem here, since it rains destruction down on the enemies arriving all around. To put it in perspective, I was running this mission on Extreme difficulty primarily using the Mortar Sentry, Eagle Cluster Bomb, and Grenade Launcher, and every time I completed the mission in 3-5 minutes. On Extreme that's 500 XP and five Medals for a few minutes work. You can find Operations that contain multiple Eradicate Automaton Forces missions, too, meaning that you can get a further seven Medals if you complete the next in the Operation.

You might be a little hesitant due to the Extreme difficulty, but this is genuinely one of the fastest and easiest mission types I've come across in 60 hours of Helldivers 2, and it seems to be temporary while the Automaton invasion is happening. The key elements required to take down those 150 bots quickly are just sentries like the Gatling and Mortar that are available early on, as well as the Eagle Cluster Bomb or similar anti-swarm airstrikes, and the Grenade Launcher, since you can just fire it into groups for easy kills. You can even set up an Autocannon Sentry and actually destroy some of the arriving dropships