Example how to post all logged events in WordPress recent events plugin Simple History to Slack

simple-history-to-slack-incoming-webhook-integration.php

<?php

// Prio 100 so we run late and give other filters chance to run
add_filter( "simple_history/log_insert_context", "on_log_insert_context_slackit", 100, 2 );

function on_log_insert_context_slackit( $context, $data ) {

	$slack_webhook_url = '<your incoming webhook url>';

	  $remote_addr = empty( $context["_server_remote_addr"] ) ? "" : $context["_server_remote_addr"];
    $level = empty( $data["level"] ) ? "" : $data["level"];
    $user_login = empty( $context["_user_login"] ) ? "" : $context["_user_login"];
    $message = SimpleLogger::interpolate( $data["message"], $context );
    $initiator = empty( $data["initiator"] ) ? "" : $data["initiator"];
    $server_http_user_agent = empty( $context["server_http_user_agent"] ) ? "" : $context["server_http_user_agent"];

    $log_message = sprintf(
        '%3$s %4$s',
        $remote_addr, // 1
        $level, // 2
        $user_login, // 3
        $message // 4
    );

    $log_message = trim( $log_message );

    $color = "";
    switch ( $level ) {

		case "debug":
			$color = "#CEF6D8";
			break;

		case "info":
			$color = "white";
			break;

		case "notice":
			$color = "#FFFFE0";
			break;

		case "warning":
			$color = "#F7D358";
			break;

		case "error":
			$color = "#F79F81";
			break;

		case "critical":
			$color = "#FA5858";
			break;

		case "alert":
			$color = "#c74545";
			break;

		case "emergency":
			$color = "#610B0B";
			break;

    }
    
    $fields = array(
		array(
			"title" => "Message",
			"value" => $log_message
		),
		array(
			"title" => "Site name",
			"value" => get_bloginfo( 'name' ) . " - " . get_bloginfo("description"),
			"short" => true,
		),
		array(
			"title" => "Site url",
			"value" => home_url(),
			"short" => true,
		),
		/*array(
			"title" => "User",
			"value" => $user_login,
			"short" => true
		),*/
		array(
			"title" => "Level",
			"value" => $level,
			"short" => true
		),
		array(
			"title" => "Initiator",
			"value" => $initiator,
			"short" => true
		),
		array(
			"title" => "Remote addr",
			"value" => $remote_addr,
			"short" => true
		),
	);

	if ( $server_http_user_agent ) {
		
		$fields[] = array(
			"title" => "User agent",
			"value" => $server_http_user_agent,
			"short" => false
		);

	}


	$author_icon = "";
	if ( function_exists("get_site_icon_url") ) {
		$author_icon = get_site_icon_url(512);
	}

    $arr_slack_data = array(
    	"username" => "WordPress Simple History",
    	"icon_url" => "https://simple-history.com/assets/uploads/2014/12/icon-5121-548c6e42_site_icon-32x32.png",
    	"text" => 'An event was logged',
    	"attachments" => array(
    		array(
    			"thumb_url" => $author_icon,
    			// "author_name" => get_bloginfo( 'name' ) . " " . home_url(),
    			// "author_link" => home_url(),
    			// "author_icon" => $author_icon,
	    		// An optional value that can either be one of good, warning, danger, or any hex color code (eg. #439FE0). This value is used to color the border along the left side of the message attachment.
	    		"color" => $color,
	    		//"title" => $log_message,
	    		//"text" => $log_message,
	    		"fields" => $fields,
    		) // attachments
    	)
    );


    $post_args = array(
		'blocking' => false,
		'timeout' => 0.01,
		'body' => json_encode( $arr_slack_data )
    );


	wp_remote_post( $slack_webhook_url, $post_args );

	return $context;

}