Definitely, the metrics to observe in influencer marketing can vary based on your campaign goals. High-level metrics include Reach (the total number of unique viewers who see the content), Engagement Rate (likes, shares, comments per post), and Impressions (how many times a post was displayed, regardless of whether it was clicked or not).

If your aim is brand awareness, focusing on impression and reach metrics would be vital. If the goal is engagement or conversions, you want to focus on likes, comments, shares, and clicks, also, trackable links can help measure direct conversions from influencer posts.

Audience feedback can be incorporated through listening tools. These can be either direct, such as surveys and polls, or indirect, through comment analysis, sentiment mapping, or social listening software. These tools help you gauge the audience’s response and engagement towards influencer posts, enabling campaign optimizations on the fly.

Platforms like Flinque offer comprehensive audience analytics and campaign reporting tools. Flinque provides a dashboard with real-time data that allows brands to track key metrics like post reactions, reach, impressions and also integrates with Google Analytics to track traffic and conversions, aiding in effective decision making.

Other tools like HYPR and AspireIQ also offer valuable analytics, but might differ slightly in their specialized features, like HYPR emphasizes audience demographics while AspireIQ places emphasis on tracking direct conversions and sales data.

Remember, while metrics are important, contextualizing these metric results is crucial within your unique marketing strategy and goals. Your choice of platform depends largely on what specific metrics or workflows your strategy emphasizes.